PhysicsNEET 2023Reflection and refraction, mirror and lens formulae

Ray Optics and Optical Instruments

In the figure shown, what is the equivalent focal length of the combination of lenses? (Assume that all layers are thin.)

Question 41 as printed in the NEET 2023 booklet

A.40 cm
B.–40 cm
C.–100 cm✓
D.–50 cm

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

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From Physics › Ray Optics and Optical Instruments › Reflection and refraction, mirror and lens formulae — lectures, notes and every past question on it.

Last revised 7 Sept 2026. Found a mistake? Tell us — corrections are the fastest thing we act on.

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