verify the laws of reflection by an activity
Answers
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, protactor 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.
Explanation:
Answer:
Aim:
To verify the laws of reflection of sound
Materials Required:
2 pipes.of equal length, Tuning fork and a hard pad, Reflecting surface like a mirror, Protractor and a pencil
Theory:
Laws of Reflection of sound
Sound follows the same laws of reflection as light
1. the incident ray, the reflected ray, and the normal lie on the same plane
2. Angle of incidence = Angle of reflection
Procedure:
1. Place a mirror on a table and draw a normal (perpendicular) on the mirror.
2. Place the two pipes on either side of the normal with a distance of at least 5 cm from the mirror.
3. Strike the tuning fork on the rubber pad and place it near one pipe.
4. Change the positions of the pipe and repeat the third step until you can hear the the sound of the tuning fork the loudest.
5. Draw a straight line from the pipe to normal.
6. You will notice that both of the lines are forming an equal angle with the normal
7. Now, strike the tuning fork with the rubber pad and place it near one of the pipes and slightly lift the other pipe and try to listen to the ringing sound. You will observe that the sound would've been fainter.
Observation:
Since the sound was best heard when both the pipes had the same angle from the normal
The laws of reflection of sound are verified.
Hope this helps
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Explanation: