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Q115
(IAS/1996)
Science & Technology › Basic Science (Physics, Chemistry, Biology) › Geometrical optics
Answer Verified
When a mirror is rotated by an angle of 6, the reflected ray will rotate by
Result
Your answer:
—
·
Correct:
C
Explanation
The correct answer is Option 3: maintain its size. This question explores the principles of Optics, specifically the laws of reflection.
According to the laws of reflection, when a plane mirror is rotated by an angle θ, the reflected ray rotates by an angle of 2θ. However, this rotation only affects the direction and angular position of the reflected ray, not its physical dimensions or properties. The size of the reflected image or the cross-section of the reflected beam is determined by the source and the properties of the reflecting surface, not the angle of rotation.
- Option 3 is correct because rotation does not cause any magnification or diminution; hence, the ray maintains its original size.
- Options 1 and 2 are incorrect as they imply a change in magnification, which requires a curved mirror or lens.
- Option 4 is incorrect as spatial distortion into a disk-like shape would require specific refractive or diffractive interference, not simple reflection.
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