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A ray parallel to principal axis is inci...

A ray parallel to principal axis is incident at `30^(@)` from normal on concave mirror having radius of curvature R. The point on principal axis where rays are focussed is Q such that PQ is

A

`(R )/(2)`

B

`(R )/(sqrt(3))`

C

`(2sqrt(R )-R )/(sqrt(2))`

D

`R(1-(1)/(sqrt(3)))`

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The correct Answer is:
D
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