Question

Describe an experiment to prove the laws of reflection​

Answer 1

Answer:

When a light ray strikes a plane mirror, the light ray reflects off the mirror.

Reflection involves a change in direction of the light ray.

• The angle of incidence is the angle between this normal line and the incident ray.
• The angle of reflection is the angle between this normal line and the reflected ray.
• According to the law of reflection, the angle of incidence equals the angle of reflection.
• Also, the incident ray, reflected ray and the normal at the point of incidence lie in the same plane.

Experiment

Aim :- To prove the law of reflection through a plane mirror.

Apparatus :- Soft board, white sheet of paper , optical pins , mirror , pencil, protractor and ruler .

Procedure :-  

1- Place the paper on the board and fix  

2- Place the mirror vertically on the white sheet of paper and trace its edge.

3- Draw a line at right angles to the edge of the edge of the mirror to act as the normal- ON .

4- Stating with angle i as 30 degree , draw an incident ray and place two pins, P and Q along it as shown

5- With your eyes at position shown, place two other pins R and S to coincide with the images of P and Q as seen in the mirror

6- Remove pins R and S and join the dots left with a straight line

7-Measure and record angle r.

8- Repeat procedure 4,5,6 and 7for angles i = 35 degree, 40 degree, 45 degree, 50 degree and 55 degree.

9- Record the results in a table.

Observation:-

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

2- Incident ray, Reflected ray and the normal at the point of incidence lie in the same plane.

Hence the laws of reflection proved.

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Answer 2

Answer:

AIM- To prove the laws of reflection.

MATERIAL REQUIRED - plane mirror, drawing sheet, pencil, setsquare, Four pins, scale.

PROCEDURE- 1) Place a plane mirror on a drawing sheet and mark its edge with a pencil.

2) Remove the mirror and with the help of Set Square ,drop a perpendicular from a point O on the line of the mirror.

3) Place the mirror back on the line.

4) Take 2 pins and place them in front of the mirror on the side of the perpendicular, one behind the other.

5) Fix two more pins on the line of the image of the pins you had fixed earlier.

6) Remove the mirror and the pins and join the lines of the pins on both sides of the perpendicular with a pencil and scale.

7) Mark the mirror line as MM' ; the perpendicular as ON, which is called the normal the line joining the first pair of pins as IO (I') and the line joining the second pair of pins as RO (R').

OBSERVATION- Measure the angle ION and angle RON. You will find that angle ION is equal to angle RON.

RESULT- (Write 2 laws of reflection here)

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