Question

both a spherical mirror and a thin spherical lens have a focal length of (-)25cm what type of mirror and lens are these

Answer 1

Answer:

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Explanation:

By convention, the focal length of a concave mirror and a concave lens are taken as negative. Hence, both the spherical mirror and the thin spherical lens are concave in nature.

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Answer 2

The correct answer is concave mirror and convex lens.

Given: Focal length = -25 cm.

To Find: Which mirror and lens have negative focal length.

Solution: According to cartesian sign convention.

• In concave mirror the center of curvature and focus lie in front of the mirror and because of this the focal length is negative.
• In convex lens the focal length is negative because the focal point is on the same side from which the light rays are coming.

Hence, concave mirror and convex lens have negative focal length.

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