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Ligtht falls on a plane reflecting surfa...

Ligtht falls on a plane reflecting surface.For what angler of incidence is the reflected ray normal to the incident ray.

A

`60^(@)`

B

`45^(@)`

C

`90^(@)`

D

`30^(@)`

Text Solution

Verified by Experts

The correct Answer is:
B
(b)
Here, XY is a plane reflecting surface. OA and AB are the incident and reflected rays
i=angle of incidence
r= angle of reflection
As, AB`bot`Oa,
`therefore i+r=90^(@)`
Also, according to laws of reflection,
r=i
`thereforei+i=90^(@)rArr2i=90^(@)`
`i=(90^(@))/(2)=45^(@)`
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Knowledge Check

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