AIPMT MAIN2008Physics-Optics
AIPMT MAIN 2008 Physics Lens Formula MCQ Question
Type: MCQ-numerical-Medium-Class 12
A boy is trying to start a fire by focusing Sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the Sun is 1.39 × 10⁹ m and its mean distance from the earth is 1.5 × 10¹¹ m. What is the diameter of the Sun's image on the paper?
A
12.4 × 10⁻⁴ m
B
9.2 × 10⁻⁴ m
C
6.5 × 10⁻⁴ m
D
6.5 × 10⁻⁵ m
Correct Answer
Option B
Detailed Explanation
Using the lens formula and magnification, the diameter of the image is calculated as d = Df/u, where D is the diameter of the Sun, f is the focal length, and u is the distance to the Sun.
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