A beam of liht from a souce L is inciden...

A beam of liht from a souce L is incident normally on a plane mirror fixed at a centain 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 at small angle `theta` , the spot of the light is found to move through a distance y on the scale.The angle `theta` is given by :

`y/x`

`x/(2y)`

`x/y`

`y/(2x)`

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