14.An object at a distance of 30 cm from concave mirror gets its image at the same point. The focal length of the mirror is?
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Answer:
15cm
Explanation:
As object and image are located at the same point and in front of concave mirror then we take u = +30 cm and v = + 30 cm. f = + 15 cm. Thus, the focal length of mirror is 15 cm.
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