Question

Passage : A light ray incident at a point 'O' on a plane mirror MM' and reflected back as shown in figur
c) A is true, Ris false
d) A is false, R is true
N
B
7.
d
α
M
B!
8.
i.
d) Normal
In the above figure, ON is known as
a) mirror
b) Incident ray
c) reflected ray
In the above figure angle 'a' is
a) angle of incidence b) angle of reflection c) angle of glancing
[ ]
d) angle of deviation
ii.
-
iii.
d) angle of deviation
-
-
iv.
d) d, a
In the above figure ZBOB' is
a) angle of incidence b) angle of reflection c) angle of glancing
From Laws of reflection, which of the angles are same always
a) a, i
b) ir
By using Laws of reflection deviation angle can be written as
a) a + 2i
b) 2i
c) 1-2i
c)r, d
-
-
V.
d) T-a​

Answer 1

Answer:

Correct option is

B

The angle of deviation d=π−2i=2α

- Angle α \& d are dependent upon angle of incidence

option A

′

is wrong as they are

option Same.

as d+L+Lγ=π

(Li= Lr rule of reflection)

∴

[2α=π−2i]

[ie=L]

∴Ld=π−2Li

So, option 'B' is correct.

Normal always make 90

∘

with Mirror

∴Lα+Li=90

∘

(i.e complemantry

not suplementry)

only option B ' is correct