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Question

Physics Question on spherical lenses

The dispersive powers of the materials of convex lens and concave lens and concave lens placed in contact are in the ratio 1 : 2. For the achromatic combination, we take convex lens of focal length 100 cm. What should be the focal length of concave lens ?

A

50 cm

B

100 cm

C

200 cm

D

None of the above.

Answer

200 cm

Explanation

Solution

Use,ω1ω2=−f1f2Use ,\frac{\omega_1}{\omega_2}=-\frac{f_1}{f_2}