Optics Question 609

Question: An achromatic combination of lenses is formed by joining

[BHU 1995; Pb. PMT 2000, 04]

Options:

A) 2 convex lenses

B) 2 concave lenses

C) 1 convex lens and 1 concave lens

D) Convex lens and plane mirror

Show Answer

Answer:

Correct Answer: C

Solution:

For an achromatic combination $ \frac{{\omega _{1}}}{f _{1}}+\frac{{\omega _{2}}}{f _{2}}=0 $ i.e. 1 convex lens and 1 concave lens.



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