Question

An object at a distance of 30 cm in front of a spherical mirror gets its image at same point. The focal length of the mirror is: A) -30cm B) -15cm C) 30cm D) 15cm​

Answer 1

Answer:

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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.

Answer 2

ANSWER ;

d. 15 cm

Explanation:

An 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 .

answer is 15 cm.