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Updated on : 2022-09-05

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Correct option is A)

To find the focal length of the concave lens

Solution:

Let focal length of the convex lens be $f_{1}$ and focal length of the concave lens be $f_{2}$ and ratio of dispersice power of the flint glass is $$\dfrac {\omega_2}{\omega_1}=1.5$$

For achromatic combination,

$f_{2}f_{1} =−ω_{1}ω_{2} ⟹f_{2}15 =−1.5⟹f_{2}=−10cm$

Hence the focal length of the concave lens is -10cm

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