A) The little chamber surrounding the mirror was filled with a viscous liquid
B) The mirror was placed in little chamber which was completely vacuum
C) The mirror was attached to a spring
D) The little chamber surrounding the mirror was filled with compressed air
Correct Answer: D
Solution :
Option [d] is correct. Explanation: The air in the little chamber surrounding the mirror is compressed, so as to act like a cushion, and deaden the movements of the mirror; the mirror is thus prevented from idly swinging about at each deflections.
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