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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 concave, but the lens convex.
D. The mirror is convex, but the lens is concave.

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As per New Cartesian Sign Conventions, the focal length of a concave mirror and focal length of a concave lens, both are negative. Therefore, both are concave. Choice (i) is correct.

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