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A spherical mirror and a thin spherical lens each have a focal length of -15 cm. The mirror and lens are likely to be

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a

both concave

b

both convex

c

mirror is concave and the lens is convex

d

mirror is convex and the lens is concave

answer is A.

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Detailed Solution

The mirror and lens are likely to be both concave.
A concave mirror has a reflecting surface that is curved inward and away from the light source. In a concave mirror, the incident ray will go in a positive direction, but after reflection, it travels in a negative direction. Hence, the focal length of a concave mirror is negative. Similarly, when the incident ray hits the focus in the convex lens, it travels in the opposite direction. Hence, the focal length of the concave lens is also negative.

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