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A source of light lies on the angle bise...

A source of light lies on the angle bisector of two plane mirrors inclined at angle `theta`. The value of `theta`, so that the light reflected from one mirror does not reach the other mirror will be.

A

`theta ge 120^@`

B

`theta ge 90^@`

C

`theta le 120^@`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
For the given question, no successive reflection can take place it the number images will be `n le`
2. Hence, `n- 1 le 2` or `n le 3`
or `(360^@)/(theta) le 3` or `120^@ le theta` or `theta ge 120^@`.
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Knowledge Check

  • A ray of light falls on a plane mirror at angle of 35^(@) . The value of theta is

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    B
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    C
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