Physics-Optical Instruments
NEET Physics Optical Instruments MCQ Question
Type: MCQ-numerical-Medium-Class 12
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?
A
7.5 cm
B
15 cm
C
22.5 cm
D
30 cm
Correct Answer
Option A
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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