STANDARDPhysics-Optics
STANDARD Physics Lens Maker's Formula MCQ Question
Type: MCQ-numerical-Medium-Class 12
Double convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of same radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm?
A
11 cm
B
22 cm
C
7 cm
D
6 cm
Correct Answer
Option B
Detailed Explanation
Using the lens maker's formula, 1/f = (μ - 1)(1/R₁ - 1/R₂), where μ = 1.55 and R₁ = R₂ = R. Solving for R when f = 20 cm gives R = 22 cm.
Found an issue with this question?