NEET Physics Reflection MCQ Question
A concave mirror forms a real, inverted image of an object placed at a distance of 30 cm from the mirror. If the magnification of the image is -2, what is the focal length of the mirror?
10 cm
15 cm
20 cm
30 cm
Correct Answer
Detailed Explanation
Using the magnification formula m = -v/u and the given magnification of -2, we find v = 60 cm. The mirror equation 1/v + 1/u = 1/f gives f = 15 cm.
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