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Achromatic Doublets

Achromatic Doublets

DLB

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Achromatic Doublets

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Achromatic doublets are cemented achromats made of two different lenses (Low dispersion positive from crown glass and high dispersion negative from flint glass). The difference of dispersion and shape of both lenses are designed to minimize the chromatic aberrations in blue (486.1nm), green (546.1nm) and red (656.3nm). Therefore, these lenses are able to support the entire visible wavelength spectrum.

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Name Diameter φD Focal length Stock * Price Add to cart
Achromatic Doublet 40mm Diameter 399.7mm Focal Length DLB-40-400PM
φ40mm 399.7mm
3-5 days
3-5 days
€82.00
- +
Achromatic Doublet 60mm Diameter 250mm Focal Length DLB-60-250PM
φ60mm 250mm
3-6 weeks
3-6 weeks
€1,834.40
- +
Achromatic Doublet 20mm Diameter 70.1mm Focal Length DLB-20-70PM
φ20mm 70.1mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 25.4mm Diameter 200.1mm Focal Length DLB-25.4-200PM
φ25.4mm 200.1mm
3-6 weeks
3-6 weeks
€65.60
- +
Achromatic Doublet 50mm Diameter 81mm Focal Length DLB-50-80PM
φ50mm 81mm
3-5 days
3-5 days
€108.80
- +
Achromatic Doublet 80mm Diameter 149.7mm Focal Length DLB-80-150PM
φ80mm −149.7mm
3-6 weeks
3-6 weeks
€2,203.00
- +
Achromatic Doublet 10mm Diameter 20mm Focal Length DLB-10-20PM
φ10mm 20mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 20mm Diameter 120.3mm Focal Length DLB-20-120PM
φ20mm 120.3mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 25.4mm Diameter 300mm Focal Length DLB-25.4-300PM
φ25.4mm 300mm
3-6 weeks
3-6 weeks
€65.60
- +
Achromatic Doublet 50mm Diameter 150.7mm Focal Length DLB-50-150PM
φ50mm 150.7mm
3-5 days
3-5 days
€100.10
- +
Achromatic Doublet 80mm Diameter 502.6mm Focal Length DLB-80-500PM
φ80mm 502.6mm
3-6 weeks
3-6 weeks
€2,203.00
- +
Achromatic Doublet 10mm Diameter 40mm Focal Length DLB-10-40PM
φ10mm 40mm
3-5 days
3-5 days
€58.70
- +
Achromatic Doublet 20mm Diameter 200.1mm Focal Length DLB-20-200PM
φ20mm 200.1mm
3-6 weeks
3-6 weeks
€61.30
- +
Achromatic Doublet 30mm Diameter 70.8mm Focal Length DLB-30-70PM
φ30mm 70.8mm
3-5 days
3-5 days
€76.00
- +
Achromatic Doublet 50mm Diameter 220.7mm Focal Length DLB-50-220PM
φ50mm 220.7mm
3-5 days
3-5 days
€100.10
- +
Achromatic Doublet 100mm Diameter 297.3mm Focal Length DLB-100-300PM
φ100mm 297.3mm
3-6 weeks
3-6 weeks
€2,571.60
- +
Achromatic Doublet 10mm Diameter 69.9mm Focal Length DLB-10-70PM
φ10mm 69.9mm
3-5 days
3-5 days
€51.40
- +
Achromatic Doublet 20mm Diameter 300mm Focal Length DLB-20-300PM
φ20mm 300mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 30mm Diameter 120.1mm Focal Length DLB-30-120PM
φ30mm 120.1mm
3-5 days
3-5 days
€72.50
- +
Achromatic Doublet 30mm Diameter 200.2mm Focal Length DLB-30-200PM
φ30mm 200.2mm
3-6 weeks
3-6 weeks
€72.50
- +
Achromatic Doublet 50mm Diameter 350.2mm Focal Length DLB-50-350PM
φ50mm 350.2mm
3-5 days
3-5 days
€100.10
- +
Achromatic Doublet 100mm Diameter 998.1mm Focal Length DLB-100-1000PM
φ100mm 998.1mm
3-5 days
3-5 days
€2,571.60
- +
Achromatic Doublet 12.7mm Diameter 25.1mm Focal Length DLB-12.7-25PM
φ12.7mm 25.1mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 25mm Diameter 60.1mm Focal Length DLB-25-60PM
φ25mm 60.1mm
3-6 weeks
3-6 weeks
€67.30
- +
Achromatic Doublet 30mm Diameter 300.4mm Focal Length DLB-30-300PM
φ30mm 300.4mm
3-5 days
3-5 days
€72.50
- +
Achromatic Doublet 50mm Diameter 500.3mm Focal Length DLB-50-500PM
φ50mm 500.3mm
3-5 days
3-5 days
€100.10
- +
Achromatic Doublet 12.7mm Diameter 50.1mm Focal Length DLB-12.7-50PM
φ12.7mm 50.1mm
3-5 days
3-5 days
€59.60
- +
Achromatic Doublet 25mm Diameter 100.2mm Focal Length DLB-25-100PM
φ25mm 100.2mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 30mm Diameter 450mm Focal Length DLB-30-450PM
φ30mm 450mm
3-5 days
3-5 days
€72.50
- +
Achromatic Doublet 50mm Diameter 800mm Focal Length DLB-50-800PM
φ50mm 800mm
3-6 weeks
3-6 weeks
€100.10
- +
Achromatic Doublet 12.7mm Diameter 79.9mm Focal Length DLB-12.7-80PM
φ12.7mm 79.9mm
3-5 days
3-5 days
€59.60
- +
Achromatic Doublet 25mm Diameter 170.4mm Focal Length DLB-25-170PM
φ25mm 170.4mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 40mm Diameter 70.3mm Focal Length DLB-40-70PM
φ40mm 70.3mm
3-6 weeks
3-6 weeks
€90.60
- +
Achromatic Doublet 50.8mm Diameter 120.2mm Focal Length DLB-50.8-120PM
φ50.8mm 120.2mm
3-6 weeks
3-6 weeks
€113.10
- +
Achromatic Doublet 15mm Diameter 30.1mm Focal Length DLB-15-30PM
φ15mm 30.1mm
3-6 weeks
3-6 weeks
€63.90
- +
Achromatic Doublet 25mm Diameter 250.8mm Focal Length DLB-25-250PM
φ25mm 250.8mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 40mm Diameter 120mm Focal Length DLB-40-120PM
φ40mm 120mm
3-5 days
3-5 days
€82.00
- +
Achromatic Doublet 50.8mm Diameter 249.4mm Focal Length DLB-50.8-250PM
φ50.8mm 249.4mm
3-6 weeks
3-6 weeks
€104.50
- +
Achromatic Doublet 15mm Diameter 59.9mm Focal Length DLB-15-60PM
φ15mm 59.9mm
3-5 days
3-5 days
€60.40
- +
Achromatic Doublet 25.4mm Diameter 50.1mm Focal Length DLB-25.4-50PM
φ25.4mm 50.1mm
3-5 days
3-5 days
€67.30
- +
Achromatic Doublet 40mm Diameter 199.7mm Focal Length DLB-40-200PM
φ40mm −199.7mm
3-5 days
3-5 days
€82.00
- +
Achromatic Doublet 50.8mm Diameter 500.3mm Focal Length DLB-50.8-500PM
φ50.8mm 500.3mm
3-6 weeks
3-6 weeks
€104.50
- +
Achromatic Doublet 15mm Diameter 100mm Focal Length DLB-15-100PM
φ15mm 100mm
3-5 days
3-5 days
€58.70
- +
Achromatic Doublet 25.4mm Diameter 80mm Focal Length DLB-25.4-80PM
φ25.4mm 80mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 40mm Diameter 300.5mm Focal Length DLB-40-300PM
φ40mm 300.5mm
3-5 days
3-5 days
€82.00
- +
Achromatic Doublet 60mm Diameter 170.8mm Focal Length DLB-60-170PM
φ60mm 170.8mm
3-6 weeks
3-6 weeks
€1,834.40
- +
Achromatic Doublet 20mm Diameter 50.2mm Focal Length DLB-20-50PM
φ20mm 50.2mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 25.4mm Diameter 149.6mm Focal Length DLB-25.4-150PM
φ25.4mm 149.6mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 40mm Diameter 450mm Focal Length DLB-40-450PM
φ40mm 450mm
3-5 days
3-5 days
€82.00
- +
Achromatic Doublet 60mm Diameter 499.1mm Focal Length DLB-60-500PM
φ60mm 499.1mm
3-6 weeks
3-6 weeks
€1,834.40
- +
Achromatic Doublet 20mm Diameter 79.9mm Focal Length DLB-20-80PM
φ20mm 79.9mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 25.4mm Diameter 222mm Focal Length DLB-25.4-220PM
φ25.4mm 222mm
3-6 weeks
3-6 weeks
€65.60
- +
Achromatic Doublet 50mm Diameter 100.5mm Focal Length DLB-50-100PM
φ50mm 100.5mm
3-5 days
3-5 days
€108.80
- +
Achromatic Doublet 80mm Diameter 200.8mm Focal Length DLB-80-200PM
φ80mm 200.8mm
3-6 weeks
3-6 weeks
€2,203.00
- +
Achromatic Doublet 10mm Diameter 25mm Focal Length DLB-10-25PM
φ10mm 25mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 20mm Diameter 149.8mm Focal Length DLB-20-150PM
φ20mm 149.8mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 30mm Diameter 50.3mm Focal Length DLB-30-50PM
φ30mm 50.3mm
3-5 days
3-5 days
€76.00
- +
Achromatic Doublet 50mm Diameter 169.8mm Focal Length DLB-50-170PM
φ50mm 169.8mm
3-6 weeks
3-6 weeks
€100.10
- +
Achromatic Doublet 80mm Diameter 800.6mm Focal Length DLB-80-800PM
φ80mm 800.6mm
3-6 weeks
3-6 weeks
€2,203.00
- +
Achromatic Doublet 10mm Diameter 50mm Focal Length DLB-10-50PM
φ10mm 50mm
3-5 days
3-5 days
€54.90
- +
Achromatic Doublet 20mm Diameter 220mm Focal Length DLB-20-220PM
φ20mm 220mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 30mm Diameter 80.3mm Focal Length DLB-30-80PM
φ30mm 80.3mm
3-5 days
3-5 days
€72.50
- +
Achromatic Doublet 50mm Diameter 249.4mm Focal Length DLB-50-250PM
φ50mm 249.4mm
3-5 days
3-5 days
€100.10
- +
Achromatic Doublet 100mm Diameter 499.6mm Focal Length DLB-100-500PM
φ100mm 499.6mm
3-6 weeks
3-6 weeks
€2,571.60
- +
Achromatic Doublet 10mm Diameter 80.1mm Focal Length DLB-10-80PM
φ10mm 80.1mm
3-5 days
3-5 days
€51.40
- +
Achromatic Doublet 25mm Diameter 40.9mm Focal Length DLB-25-40PM
φ25mm 40.9mm
3-5 days
3-5 days
€67.30
- +
Achromatic Doublet 30mm Diameter 150mm Focal Length DLB-30-150PM
φ30mm 150mm
3-6 weeks
3-6 weeks
€72.50
- +
Achromatic Doublet 30mm Diameter 220.2mm Focal Length DLB-30-220PM
φ30mm 220.2mm
3-5 days
3-5 days
€72.50
- +
Achromatic Doublet 50mm Diameter 400mm Focal Length DLB-50-400PM
φ50mm 400mm
3-5 days
3-5 days
€100.10
- +
Achromatic Doublet 12.7mm Diameter 30mm Focal Length DLB-12.7-30PM
φ12.7mm 30mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 25mm Diameter 69.9mm Focal Length DLB-25-70PM
φ25mm 69.9mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 30mm Diameter 350mm Focal Length DLB-30-350PM
φ30mm 350mm
3-5 days
3-5 days
€72.50
- +
Achromatic Doublet 50mm Diameter 599.9mm Focal Length DLB-50-600PM
φ50mm 599.9mm
3-6 weeks
3-6 weeks
€100.10
- +
Achromatic Doublet 12.7mm Diameter 60mm Focal Length DLB-12.7-60PM
φ12.7mm 60mm
3-6 weeks
3-6 weeks
€59.60
- +
Achromatic Doublet 25mm Diameter 119.8mm Focal Length DLB-25-120PM
φ25mm 119.8mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 30mm Diameter 500mm Focal Length DLB-30-500PM
φ30mm 500mm
3-5 days
3-5 days
€72.50
- +
Achromatic Doublet 50mm Diameter 1000mm Focal Length DLB-50-1000PM
φ50mm 1000mm
3-5 days
3-5 days
€100.10
- +
Achromatic Doublet 12.7mm Diameter 100.1mm Focal Length DLB-12.7-100PM
φ12.7mm 100.1mm
3-5 days
3-5 days
€58.70
- +
Achromatic Doublet 25mm Diameter 200.1mm Focal Length DLB-25-200PM
φ25mm 200.1mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 40mm Diameter 80.2mm Focal Length DLB-40-80PM
φ40mm 80.2mm
3-5 days
3-5 days
€90.60
- +
Achromatic Doublet 50.8mm Diameter 150.7mm Focal Length DLB-50.8-150PM
φ50.8mm 150.7mm
3-5 days
3-5 days
€104.50
- +
Achromatic Doublet 15mm Diameter 40.1mm Focal Length DLB-15-40PM
φ15mm 40.1mm
3-5 days
3-5 days
€63.90
- +
Achromatic Doublet 25mm Diameter 300mm Focal Length DLB-25-300PM
φ25mm 300mm
3-6 weeks
3-6 weeks
€65.60
- +
Achromatic Doublet 40mm Diameter 150.1mm Focal Length DLB-40-150PM
φ40mm 150.1mm
3-5 days
3-5 days
€82.00
- +
Achromatic Doublet 50.8mm Diameter 299.5mm Focal Length DLB-50.8-300PM
φ50.8mm −299.5mm
3-6 weeks
3-6 weeks
€104.50
- +
Achromatic Doublet 15mm Diameter 70.2mm Focal Length DLB-15-70PM
φ15mm 70.2mm
3-5 days
3-5 days
€60.40
- +
Achromatic Doublet 25.4mm Diameter 60.1mm Focal Length DLB-25.4-60PM
φ25.4mm 60.1mm
3-5 days
3-5 days
€67.30
- +
Achromatic Doublet 40mm Diameter 220.7mm Focal Length DLB-40-220PM
φ40mm 220.7mm
3-6 weeks
3-6 weeks
€82.00
- +
Achromatic Doublet 50.8mm Diameter 700mm Focal Length DLB-50.8-700PM
φ50.8mm 700mm
3-6 weeks
3-6 weeks
€104.50
- +
Achromatic Doublet 20mm Diameter 30.6mm Focal Length DLB-20-30PM
φ20mm 30.6mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 25.4mm Diameter 100.2mm Focal Length DLB-25.4-100PM
φ25.4mm 100.2mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 40mm Diameter 349.9mm Focal Length DLB-40-350PM
φ40mm 349.9mm
3-5 days
3-5 days
€82.00
- +
Achromatic Doublet 60mm Diameter 200.3mm Focal Length DLB-60-200PM
φ60mm 200.3mm
3-6 weeks
3-6 weeks
€1,834.40
- +
Achromatic Doublet 20mm Diameter 60.2mm Focal Length DLB-20-60PM
φ20mm 60.2mm
3-6 weeks
3-6 weeks
€65.60
- +
Achromatic Doublet 25.4mm Diameter 170.4mm Focal Length DLB-25.4-170PM
φ25.4mm 170.4mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 40mm Diameter 500mm Focal Length DLB-40-500PM
φ40mm 500mm
3-5 days
3-5 days
€82.00
- +
Achromatic Doublet 60mm Diameter 597.9mm Focal Length DLB-60-600PM
φ60mm 597.9mm
3-6 weeks
3-6 weeks
€1,834.40
- +
Achromatic Doublet 20mm Diameter 99.5mm Focal Length DLB-20-100PM
φ20mm −99.5mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 25.4mm Diameter 250.8mm Focal Length DLB-25.4-250PM
φ25.4mm 250.8mm
3-6 weeks
3-6 weeks
€65.60
- +
Achromatic Doublet 50mm Diameter 120.2mm Focal Length DLB-50-120PM
φ50mm 120.2mm
3-6 weeks
3-6 weeks
€108.80
- +
Achromatic Doublet 80mm Diameter 299.8mm Focal Length DLB-80-300PM
φ80mm 299.8mm
3-6 weeks
3-6 weeks
€2,203.00
- +
Achromatic Doublet 10mm Diameter 30.1mm Focal Length DLB-10-30PM
φ10mm 30.1mm
3-5 days
3-5 days
€59.60
- +
Achromatic Doublet 20mm Diameter 170mm Focal Length DLB-20-170PM
φ20mm 170mm
3-6 weeks
3-6 weeks
€61.30
- +
Achromatic Doublet 30mm Diameter 60.3mm Focal Length DLB-30-60PM
φ30mm 60.3mm
3-6 weeks
3-6 weeks
€76.00
- +
Achromatic Doublet 50mm Diameter 200.1mm Focal Length DLB-50-200PM
φ50mm 200.1mm
3-5 days
3-5 days
€100.10
- +
Achromatic Doublet 100mm Diameter 200.6mm Focal Length DLB-100-200PM
φ100mm 200.6mm
3-6 weeks
3-6 weeks
€2,571.60
- +
Achromatic Doublet 10mm Diameter 60.1mm Focal Length DLB-10-60PM
φ10mm 60.1mm
3-5 days
3-5 days
€51.40
- +
Achromatic Doublet 20mm Diameter 250mm Focal Length DLB-20-250PM
φ20mm 250mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 30mm Diameter 100.7mm Focal Length DLB-30-100PM
φ30mm 100.7mm
3-5 days
3-5 days
€72.50
- +
Achromatic Doublet 30mm Diameter 169.9mm Focal Length DLB-30-170PM
φ30mm 169.9mm
3-5 days
3-5 days
€72.50
- +
Achromatic Doublet 50mm Diameter 299.5mm Focal Length DLB-50-300PM
φ50mm −299.5mm
3-5 days
3-5 days
€100.10
- +
Achromatic Doublet 100mm Diameter 799.5mm Focal Length DLB-100-800PM
φ100mm 799.5mm
3-6 weeks
3-6 weeks
€2,571.60
- +
Achromatic Doublet 10mm Diameter 100.5mm Focal Length DLB-10-100PM
φ10mm 100.5mm
3-5 days
3-5 days
€51.40
- +
Achromatic Doublet 25mm Diameter 50.1mm Focal Length DLB-25-50PM
φ25mm 50.1mm
3-6 weeks
3-6 weeks
€67.30
- +
Achromatic Doublet 30mm Diameter 249.7mm Focal Length DLB-30-250PM
φ30mm 249.7mm
3-5 days
3-5 days
€72.50
- +
Achromatic Doublet 50mm Diameter 451.5mm Focal Length DLB-50-450PM
φ50mm 451.5mm
3-5 days
3-5 days
€100.10
- +
Achromatic Doublet 12.7mm Diameter 40.1mm Focal Length DLB-12.7-40PM
φ12.7mm 40.1mm
3-5 days
3-5 days
€61.30
- +
Achromatic Doublet 25mm Diameter 80mm Focal Length DLB-25-80PM
φ25mm 80mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 30mm Diameter 400mm Focal Length DLB-30-400PM
φ30mm 400mm
3-6 weeks
3-6 weeks
€72.50
- +
Achromatic Doublet 50mm Diameter 700mm Focal Length DLB-50-700PM
φ50mm 700mm
3-6 weeks
3-6 weeks
€100.10
- +
Achromatic Doublet 12.7mm Diameter 69.9mm Focal Length DLB-12.7-70PM
φ12.7mm 69.9mm
3-5 days
3-5 days
€59.60
- +
Achromatic Doublet 25mm Diameter 149.6mm Focal Length DLB-25-150PM
φ25mm 149.6mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 40mm Diameter 60.2mm Focal Length DLB-40-60PM
φ40mm 60.2mm
3-5 days
3-5 days
€90.60
- +
Achromatic Doublet 50.8mm Diameter 100.5mm Focal Length DLB-50.8-100PM
φ50.8mm 100.5mm
3-6 weeks
3-6 weeks
€113.10
- +
Achromatic Doublet 15mm Diameter 25.2mm Focal Length DLB-15-25PM
φ15mm 25.2mm
3-5 days
3-5 days
€63.90
- +
Achromatic Doublet 25mm Diameter 222mm Focal Length DLB-25-220PM
φ25mm 222mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 40mm Diameter 99.9mm Focal Length DLB-40-100PM
φ40mm 99.9mm
3-5 days
3-5 days
€90.60
- +
Achromatic Doublet 50.8mm Diameter 200.1mm Focal Length DLB-50.8-200PM
φ50.8mm 200.1mm
3-6 weeks
3-6 weeks
€104.50
- +
Achromatic Doublet 15mm Diameter 50.1mm Focal Length DLB-15-50PM
φ15mm 50.1mm
3-5 days
3-5 days
€60.40
- +
Achromatic Doublet 25.4mm Diameter 40.9mm Focal Length DLB-25.4-40PM
φ25.4mm 40.9mm
3-5 days
3-5 days
€67.30
- +
Achromatic Doublet 40mm Diameter 169.7mm Focal Length DLB-40-170PM
φ40mm 169.7mm
3-5 days
3-5 days
€82.00
- +
Achromatic Doublet 50.8mm Diameter 400mm Focal Length DLB-50.8-400PM
φ50.8mm 400mm
3-6 weeks
3-6 weeks
€104.50
- +
Achromatic Doublet 15mm Diameter 79.9mm Focal Length DLB-15-80PM
φ15mm 79.9mm
3-5 days
3-5 days
€60.40
- +
Achromatic Doublet 25.4mm Diameter 69.9mm Focal Length DLB-25.4-70PM
φ25.4mm 69.9mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 40mm Diameter 249.1mm Focal Length DLB-40-250PM
φ40mm 249.1mm
3-5 days
3-5 days
€82.00
- +
Achromatic Doublet 50.8mm Diameter 1000mm Focal Length DLB-50.8-1000PM
φ50.8mm 1000mm
3-6 weeks
3-6 weeks
€104.50
- +
Achromatic Doublet 20mm Diameter 40.1mm Focal Length DLB-20-40PM
φ20mm 40.1mm
3-5 days
3-5 days
€65.60
- +
Achromatic Doublet 25.4mm Diameter 119.8mm Focal Length DLB-25.4-120PM
φ25.4mm 119.8mm
3-5 days
3-5 days
€65.60
- +
◦The spherical aberration of achromatic doublets is better than singlets and minimized at infinite conjugate ratios.
◦Achromatic Doublets are coated on both surfaces with a broadband multi-layer anti-reflection coating for the visible wavelength (400 − 700nm).
◦Set the positive part to the side of the incident parallel beam and put the negative part to the side of the focal point to minimize spherical aberration.
◦The difference in focal length of a lens at each wave length is Chromatic aberration and is due to “dispersion of the glass”, the change in refractive index of glass according to wavelength. This can be corrected by combining glasses with low and high dispersions. Spherical aberration is when a ray enters a lens farther from its optical axis and has a shorter focus than a paraxial focus.

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