faithreal5144 faithreal5144
  • 09-04-2024
  • Physics
contestada

The dispersive powers of lenses used in an achromatic combination are in ratio 5: 3. If focal length of the concave lens is 15 cm, the nature and focal length of other lens will be -
A. Convex, 9 cm
B. Concave, 9 cm
C. Convex, 25 cm
D. Concave, 25 cm

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