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Old Mar 20th 2017, 08:44 AM   #1
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Concave Mirror

Q.) A student has three concave mirrors A, B, C of focal lengths 20 cm, 15 cm and 10 cm respectively. Out of the three mirror identify the mirror which would be preferred to be used for shaving purpose.
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Old Mar 20th 2017, 10:22 AM   #2
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What do you think?

When a mirror is used as a shaving mirror it is in virtual, magnifying mode.

Therefore the object has to be between the focus and the mirror.
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Old Mar 20th 2017, 11:57 AM   #3
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I agree. But I couldn't reach the answer still. Does it have something to do with least distance of distinct vision.
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Old Mar 20th 2017, 01:03 PM   #4
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How close to a mirror can you get and still operate a razor?
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Old Mar 20th 2017, 05:15 PM   #5
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Mirrors of 15 or 20 cm focal length can be used as per my understanding.20 cm will be more apt.
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Old Mar 20th 2017, 10:36 PM   #6
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Originally Posted by Naazima View Post
I agree. But I couldn't reach the answer still. Does it have something to do with least distance of distinct vision.
?
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Old Mar 30th 2017, 12:27 AM   #7
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Originally Posted by Naazima View Post
Mirrors of 15 or 20 cm focal length can be used as per my understanding.20 cm will be more apt.
Please tell if the correct answer is 15 cm or 20 cm?
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