Class 10 Light: Mirror Formula, Lens Formula and Power
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Question
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An object is placed 30 cm in front of a concave mirror of focal length 15 cm. Where is the image, and what is it like?
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Answer
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30 cm in front of the mirror, real, inverted and the same size
With u = −30 cm and f = −15 cm, 1/v = 1/f − 1/u = −1/15 + 1/30 = −1/30, so v = −30 cm. The object is at C, so the image is at C: real, inverted and the same size.
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