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Light Reflection and Refraction
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30/11/2020 6:31 pm
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An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is
(a) -30 cm
(b) 30 cm
(c) -15 cm
(d) +15 cm
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30/11/2020 6:32 pm
(c) -15 cm
Explanation:
When object is placed at 2F, the image formed by concave mirror is also at 2F.
So 2F = -30 or F = -15 cm.