NEET Physics Optical Instruments MCQ Question
A convex lens forms an image at a distance of 30 cm on the opposite side of the object. If the object distance is 10 cm, what is the focal length of the lens?
7.5 cm
15 cm
22.5 cm
30 cm
Correct Answer
Detailed Explanation
Using the lens formula 1/v - 1/u = 1/f, where v = 30 cm and u = -10 cm, we find the focal length f = 7.5 cm.
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