Home Physics Ray Optics NEET Previous Year Question Two thin lenses are of same focal lengths (f…
Physics Ray Optics NEET Previous Year Question MCQ (Single Correct)

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 [NEET 2023]

A
f/4
B
f/2
C
infinite
D
Zero

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The correct answer is:
C

Focal length of convex lens,

Focal length of concave lens,

When both lenses are kept in contact, then equivalent focal length (F) is given by

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