1. State the laws of reflection. Describe an activity to show that incident ray,
reflected ray and the normal, at the point of incidence, all lie in same plane.
2. Trace the path of reflected ray in the following ray diagrams.
(b)
(a)
30°
Answers
Answer:
The laws of reflection
The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.
1. Describe an activity to show that incident ray,
reflected ray and the normal, at the point of incidence, all lie in same plane.
For this experiment take a plane mirror and stand it on a plane sheet of paper with a block. Now draw an incidence line AB. Now see in the mirror and mark the points on the paper, where you fill the line is travelling after getting reflected from the mirror. Remove the mirror and draw a perpendicular on the mirror line. Join the points to make the reflected ray. You will see that incident ray, reflected ray and normal will be in the same plane, i.e. on the sheet of paper.
2. Trace the path of reflected ray in the following ray diagrams.
