Q. 18: A source of laser (S), a receiver (R) and a fixed mir- ror (F) - all lie on an arc of a circle of radius R = 0.5 km. The distance between the source and the receiver is d = 0.5 m. At the centre of the circle there is a small mirror M which is rotating with angular speed o (see figure). Find smallest value of o is if it is seen that the source shoots a laser pulse which gets reflected at M, then gets reflected at F and finally gets reflected at M to be received by the receiver. M d R
Q. 18: A source of laser (S), a receiver (R) and a fixed mir- ror (F) - all lie on an arc of a circle of radius R = 0.5 km. The distance between the source and the receiver is d = 0.5 m. At the centre of the circle there is a small mirror M which is rotating with angular speed o (see figure). Find smallest value of o is if it is seen that the source shoots a laser pulse which gets reflected at M, then gets reflected at F and finally gets reflected at M to be received by the receiver. M d R
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Transcribed Image Text:Q. 18: A source of laser (S), a receiver (R) and a fixed mir-
ror (F) – all lie on an are of a circle of radius R = 0.5 km.
The distance between the source and the receiver is d = 0.5
m. At the centre of the circle there is a small mirror M which
is rotating with angular speed o (see figure). Find smallest
value of o is if it is seen that the source shoots a laser pulse
which gets reflected at M, then gets reflected at F and finally
gets reflected at M to be received by the receiver.
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