AIPMT MAIN2008Physics-Optics
AIPMT MAIN 2008 Physics Lens Power MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial. The power of the combinations is
A
f₁ + f₂
B
f₁f₂ / (f₁ + f₂)
C
f₁f₂ / 2
D
(f₁ + f₂) / 2
Correct Answer
Option A
Detailed Explanation
The power of a combination of lenses in contact is given by the sum of their individual powers. Since power P = 1/f, the combined power is P = 1/f₁ + 1/f₂.
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