NEET Physics Reflection MCQ Question
A concave mirror forms a real, inverted image of an object placed 15 cm in front of it. If the image is formed 30 cm from the mirror, what is the focal length of the mirror?
10 cm
15 cm
20 cm
30 cm
Correct Answer
Detailed Explanation
Using the mirror equation 1/f = 1/v + 1/u, where v = -30 cm (real image) and u = -15 cm (object distance), we get 1/f = 1/(-30) + 1/(-15). Solving gives f = -10 cm.
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