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The angle of deviation of a light ray reflected by a plane mirror is `150^(@)`. The angle of refection is _____.

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The angle of deviation of a light ray reflected by a plane mirror is `150^(@)`. The angle of refection is _____.
A. `30^(@)`
B. `60^(@)`
C. `15^(@)`
D. `10^(@)`
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Correct Answer - C
The angle of deviation d =180-2i=180-2r
150=180-2r
`2r=30^(@)r=15^(@)`
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