A spherical mirror and a thin spherical lens have each a focal length – InterviewSolution

1.	A spherical mirror and a thin spherical lens have each a focal length of -15 cm. The mirror and lens are likely to be(a) both concave (b) both convex(c) the mirror is concave and the lens is convex(d) the mirror is convex and the lens is concave
Answer» Concave mirror and concave lens both have negative focal length, choice (c) is correct

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