AIIMS2000Physics-Optics
AIIMS 2000 Physics Lens Power MCQ Question
Type: MCQ-numerical-Medium-Class 12
A doctor advices a patient to use spectacles with a convex lens of focal length 40 cms in contact with a concave lens of focal length 25 cms. What is the power of the resultant combination?
A
1.5 D
B
-1.5 D
C
6.5 D
D
-6.5 D
Correct Answer
Option B
Detailed Explanation
The power of a lens combination is the sum of the powers of individual lenses. The power of a lens is the reciprocal of its focal length in meters.
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