Question

A parallel beam of light is focused at a distance of 10 cm by a concave mirrir.what is the focal lengrh of concave mirror

Answer 1

Hi dear, here's your answer.
When mirrir is concave,parallel beam of light is focused on principal focus.Distance between pole and principal focus is it's focal length.So,the focal length is 10cm.
Hope it helps.
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Answer 2

Answer:

focal length is 10cm because the mirror is concave mirror