Question

3. 1 4 90° Angle of Angle of Incidence Reflection Candle Normal i If the angle of incidence is 30° the angle of refraction is B) 60° A) 30° C) 90° D) 40​

Answer 1

Answer:

B 60°

Explanation:

In the figure, the incident ray, the normal, and the angle of incidence (i) are shown. i=30.

From law of reflection i=r.

So, construct the reflected ray at 30 degrees from the normal and let it fall on the other mirror.

Now draw the second normal at the point of incidence and again measure the angle of incidence, and draw the angle of reflection.

If you consider triangle AOB, one angle is ∠AOB=90

0

and ∠OAB is 60

0

From angle sum property third angle ie ∠ABO=180

0

−90

0

−60

0

=30

0

So, the second incident angle will be 60

0

.

Hence, the second reflected angle will be 60 degrees.