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Two plane mirrors are inclined at angle ...

Two plane mirrors are inclined at angle `theta`.A ray of light is incident on one mirror at an angle of incidence.i.The ray is reflected from this mirror,falls on the second mirror from where it is reflected parallel to the first mirror .What is the value of i,the angle of incident in term of `theta`?

A

`20 - 90^(@)`

B

`40 -90^(@)`

C

`0- 90 (@)`

D

30-90^(@)`

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