MPSC PYQScienceenglish

Two thin lenses of focal length +4 m and −2 m are placed in contact. What is the focal length of the combined lens?

A.−4 m
B.+2 m
C.+4 m
D.−2 m

Correct answer: A

Source paper

MPSC Assistant Preliminary Examination 2011 (Set A) (English)

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