When an object is placed in front of a concave mirror at a distance 30cm from an image is obtained on a screen at a distance of 20 cm from the mirror. Find the focal length of the mirror.

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When an object is placed in front of a concave mirror at a distance 30cm from an image is obtained on a screen at a distance of 20 cm from the mirror. Find the focal length of the mirror.

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-6cm

+6cm

-12cm

+12cm

answer is C.

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Detailed Solution

Concept: A convex mirror has a negative focal length, while a concave mirror has a positive one. A concave mirror is a spherical mirror that satisfies the rules of light reflection and has an internally curved reflective surface. It is possible to imagine that the light beams coming from a distant object are parallel to one another.