Question

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 q,
the spot of the light is found to move through a
distance y on the scale. The angle q is given by
?​

Answer 1

Answer:

☆Answered by Rohith kumar. R. maths dude:-

The answer for your question. is

☆If the mirror is located by theta

☆And the angle reflection is theta

▪tan2 theta = y

x

▪2 theta = y

x

▪theta = y

2x

☆Refer the answer in figure which is in attachment.

☆▪Hope it helps u @Mistified boy .

Answer 2

If mirror is rotated by angle θ

angle of refrection is 2θ

tan2θ= y/x

2θ=y/x

θ=y/2x

Hope that helps