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The circular boundary of the concave mir...

The circular boundary of the concave mirror subtends a cone of half angle `theta` at its centre of curvature. The minimum value of `theta` for which any ray incident on this mirror parallel to the principal axis suffers reflection more than once is
.

A

`30^(@)`

B

`45^(@)`

C

`60^(@)`

D

`75^(@)`

Text Solution

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The correct Answer is:
B
.
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