Question

1)Find the angle of incidence in the 1st mirror 1 in the device shown in Figure 1.

2. Find the angle between the incident ray and reflected ray in the 2nd mirror 2 in the
device shown in Figure1.

Answer 1

Answer:

We know that angle of incidence and angle of reflection both are measured from normal which is perpendicular to the plane.

Let,

Angle of incidence =i

Angle of reflection =r

Normal ON is perpendicular to plane.

So, angle of incidence, i=90

0

−30

0

=60

0

We know that angle of incidence=angle of reflection

So, angle of incidence=angle of reflection =60

0

Hence, angle between incident ray(AO) and reflected ray(OB) is =i+r=60

0

+60

0

=120

0