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 1. When the mirror is rotated through a small angle 8, the spot of
the light is found to move through a distance y on the scale. The angle is given by :
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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 1. When the mirror is rotated through a small angle 8, the spot of
the light is found to move through a distance y on the scale. The angle is given by :
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