Physics Optics Refraction and Reflection

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 -

1

Convex, 9 cm

2

Concave, 9 cm

3

Convex, 25 cm

4

Concave, 25 cm

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