Geometrical OpticsMedium

Question

A light ray I is incident on a plane mirror M. The mirror is rotated in the direction as shown in the figure by an arrow at frequency 9/π rev/s. The light reflected by the mirror is received on the wall W at a distance 10 m from the axis of rotation When the angle of incidence become 37o the speed of the spot (a point) on the wall is :

Options

A.10 m/s
B.1000 m/s
C.360 m/s
D.None of these

Solution


As we know the ωreflected = 2ωmirror
ωR = 2 × 2π × = 18 × 2 = 36 ∴ vS cos 37o = v
vS = c sec 53o = RωR sec 53o  = 10 (sec 53o)2 × 18
= 10 × × 18 × 2  = 1000 m/s

Create a free account to view solution

View Solution Free
Topic: Geometrical Optics·Practice all Geometrical Optics questions

More Geometrical Optics Questions

A Person wears glasses of power - 2.0 D. The defect of the eye and the far point of the person without the glasses will ...The apparent depth of water in cylindrical water tank of diameter 2R cm is reducing at the rate of x cm/minute when wate...Figure shows a glass cube surrounded by four glass prisms in very close proximity to its sides. The path that will be ta...A plane mirror is pleased at the bottom of a tank containing a liquid refractive indexμ. P is a small object at a h...The angle of a prism is A. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on...