If a light ray is reflected from a mirror as shown in the figure, then

Options

A. the glancing angle of light ray is `45^(@)`.
B. the reflected light ray is perpendicular to the incident light ray.
C. the reflected light is deviated through an alnge of `90^(@)`
D. All the above.

Answer

D

Explanation

(1) From the figure

`i+r=90^(@)`
But i=r
`2i=90^(@)`
`i=45^(@)`
`anglex+anglei=90^(@)`
`anglex=90^(@)-45^(@)`
`=45^(@)`
(2) From the given figure , i.e., reflected light is perpendicular to incident light.
(3) From figure, `y=90^(@)-45^(@)=45^(@)andanglePOM=angleNOQ`
`:.angleQOQ^(1)` = angle of deviation
`angleQON+angleNOQ^(1)`
`=45^(@)+45^(@)`
`=90^(@)`