STANDARDPhysics-Optics
STANDARD Physics Lens Maker's Formula MCQ Question
Type: MCQ-numerical-Medium-Class 12
What is the refractive index of material of a planoconvex lens, if the radius of curvature of the convex surface is 10 cm and focal length of the lens is 30 cm?
A
6/5
B
7/4
C
2/3
D
4/3
Correct Answer
Option D
Detailed Explanation
Using the lens maker's formula, 1/f = (μ - 1)(1/R₁ - 1/R₂), where R₁ = ∞ (for plane surface) and R₂ = -10 cm. Solving for μ when f = 30 cm gives μ = 4/3.
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