NEET2017Physics-Optics
NEET 2017 Physics Reflection MCQ Question
Type: MCQ-conceptual-Medium-Class 12
A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle θ, the spot of the light is found to move through a distance y on the scale. The angle θ is given by
A
x / y
B
x / 2y
C
y / x
D
y / 2x
Correct Answer
Option D
Detailed Explanation
The angle of deviation of the reflected beam is twice the angle of rotation of the mirror. Using geometry, θ = x / 2y.
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