AIPMT MAINS2011Physics-Optics
AIPMT MAINS 2011 Physics Lens Formula MCQ Question
Type: MCQ-numerical-Medium-Class 12
A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is
A
−30 cm
B
5 cm
C
−10 cm
D
20 cm
Correct Answer
Option A
Detailed Explanation
Using the lens formula, 1/v - 1/u = 1/f, and given values, the focal length f is calculated to be −30 cm.
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