AIPMT PRELIMS2006Physics-Optics
AIPMT PRELIMS 2006 Physics Refraction MCQ Question
Type: MCQ-conceptual-Medium-Class 12
A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again?
A
1 cm upward
B
0.5 cm downward
C
1 cm downward
D
0.5 cm upward
Correct Answer
Option A
Detailed Explanation
The apparent shift in the position of the mark due to the glass slab is given by the formula: shift = thickness × (1 - 1/refractive index). Substituting the given values, the shift is 3 cm × (1 - 1/1.5) = 1 cm. Therefore, the microscope should be moved 0.5 cm downward to refocus.
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