AIPMT PRELIMS2011Physics-Optics
AIPMT PRELIMS 2011 Physics Lens Formula and Magnification MCQ Question
Type: MCQ-numerical-Medium-Class 12
A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options describe best the image formed of an object of height 2 cm placed 30 cm from the lens?
A
Real, inverted, height = 1 cm
B
Virtual, upright, height = 1 cm
C
Virtual, upright, height = 0.5 cm
D
Real, inverted, height = 4 cm
Correct Answer
Option D
Detailed Explanation
In general we have assumed μ = 1.5, so, f = 20 cm and calculate v = 60 cm. The magnification is v/u = -2, so |h₁/h₀| = 2, hence |h₁| = 2 × |h₀|.
Found an issue with this question?