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Q.

Two thin lenses are of same focal lengths (f) but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be:

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a

Infinite

b

f/4

c

Zero

d

f / 2

answer is A.

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Detailed Solution

detailed_solution_thumbnail

The focal length of the combination is given
by
1fcombination =1fconcave +1fconvex ⇒1fcombination =1f+1−f=0⇒fcombination =∞

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