Physics-Reflection
NEET Physics Reflection MCQ Question
Type: MCQ-numerical-Easy-Class 12
A small needle is placed on the principal axis of an equiconvex lens with a refractive index of 1.50 and its inverted image coincides with the needle. If the needle is 45.0 cm from the lens when a liquid layer is present and 30.0 cm when the liquid is removed, what is the refractive index of the liquid?
A
40
B
45
C
60
D
55
Correct Answer
Option D
Detailed Explanation
When the liquid is present, it changes the effective focal length of the lens system. Using the lens formula and the given distances, the refractive index of the liquid can be calculated to be approximately 1.55.
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