Verification of the Laws of Reflection
The laws of reflection are,
- The incident ray, reflected ray, and normal to the surface lies in the same plane.
- The angle of incidence \(i\) is equal to the angle of reflection \(r\).
A plane mirrors, scale, protractor, thermocol sheet, white paper, pins.
- Fix the white paper on the thermocol sheet with the help of pins.
- Place the mirror near to one edge of the paper and mark its position.
- Place two pins vertically on one side of the normal so that line joining two pins make an angle of approximately 30 degree with the normal.
- See image of two pins from other side of the normal and place a pin vertically so that it is in line with images of other two pins. Similarly, place one more pin at some distance from this pin.
- Extend the lines. Measure angle of incidence and angle of reflection.
- Repeat for two more incident angles (say 45 degree and 60 degree).
- Now, see the head of the pins in step (3). Raise one of the pin and press another pin. Now repeat step (4) such that images of the pin-head are aligned. Visualise the plane containing incident ray, reflected ray and normal. You may place a paper on this plane. Raise another pin and visualize again.
Write the results in the form of a table.