JSS 3 examination

LAW OF REFLECTION PRACTICAL

Aim

To verify the Law of Reflection which states that:

1. The angle of incidence equals the angle of reflection.

2. The incident ray, reflected ray, and the normal all lie on the same plane.

Materials Needed: Plane mirror, Drawing board or cardboard, White sheet of paper, Pins (4 or more), Protractor, Ruler, Pencil.

Procedure: 1.Fix the plain sheet of paper on the drawing board. 2.Draw a straight line near the center — this will represent the mirror line. 3.Place the plane mirror vertically along this line and hold it firmly. 4.Draw a normal line (a line perpendicular to the mirror line) using the protractor. 5.Choose an angle of incidence — e.g., 30° or 35⁰ 6.Fix two pins on the paper to represent the incident ray such that the line from the pins makes 30° with the normal. 7.Look into the mirror and place two more pins so that they appear in a straight line with the images of the incident pins. These represent the reflected ray. 8.Remove the mirror, join the pin holes, and label the incident ray, reflected ray, and normal. 9.Measure the angle of reflection using the protractor.