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 0, the spot of the light is found to move through a distance y on the scale. The angle 0 is given by [2017] - VgyanHub

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 0, the spot of the light is found to move through a distance y on the scale. The angle 0 is given by [2017]

Options :

(a) y/2x
(b) y/x
(c) x/2y
(d) x/y

Answer :

(a) y/2x

Answer Steps :

step 1

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