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A beam of light from a source L is incid...

A beam of light from a source `L` is incident normally on a plane mirrorr 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 mirrorr is rotated through a 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 `:`

A

`y/(2x)`

B

`y/x`

C

`x/(2y)`

D

`x/y`

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The correct Answer is:
A
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Knowledge Check

  • 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 theta , the spot of the light is found to move through a distance y on the scale. The angle theta is given by:

    A
    `y/x`
    B
    `x/(2y)`
    C
    `x/y`
    D
    `y/(2x)`

  • A beam of light from a source L is incident normally on a plane mirror fixed at a certin distance x from the source. The beam is reflacted back as a spot on a scale placed just above the surce L. When the mirror is rotated through a 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

    A
    `y/(2x)`
    B
    `y/(x)`
    C
    `x/(2y)`
    D
    `x/(y)`

  • A ray of light is incident normally on a plane mirrorr. The angle of reflection will be

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    `0^(@)`
    B
    `90^(@)`
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