A light ray incidents at an angle `30^(@)` on a plane mirror and undergoes reflection. Arrange the following steps to determine the glancing angle of reflection.
(A) The glancing angle of reflection is equal to glancing angle of incidence.
(B) Get the value of angle of incidence `anglei` from the given data.
(C) The glancing angle of incidence `angleg`, is equal to `(90^(@)- anglei)`

Options

A. BCA
B. CBA
C. CAB
D. BAC

Answer

A

Explanation

Given that `anglei=30^(@)-(B)`
Other `angleg+anglei=90^(@)`
`rArr angleg_(i)+anglei=90^(@)`
`rArr angleg_(R)= angleg_(i)=60^(@)-(A)`
Hence the correct option is (a).