SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An object at a distance of 30 cm from aconcave mirror gets its image at the same point. The focal length of the mirror is
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-30 cm
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30 cm
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-15 cm
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+15 cm
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Explanation:
Detailed explanation-1: -It’s a simple one. If the object distance (u) is 30 cm and image distance (v) is also 30cm. Then, f=15cm.
Detailed explanation-2: -When an object is kept at a distance of 30 cm from a concave mirror, the image is formed at a distance of 10 cm.
Detailed explanation-3: -Solution: We have, u = – 30 cm and f = – 20 cm. So, the image will be formed 60 cm from the mirror.
There is 1 question to complete.