Question

write activity to prove rectilinear propagation of light.​

Answer 1

RECTILINEAR PROPERTY OF LIGHT

1)According to FERMAT'S PRINCIPLE,

light takes the path that takes the minimum time to traverse.

2)Generally light chooses the straight path which is the shortest path connecting any two points according to euclidean geometry.

Experiment

1)Take one candle and 3 cardboards for the experiment

2)Then place them in a line as shown in the attachment.

3)Make 3 holes in cardboard such that the holes are in same line with the candle as in the attachment shown above.

4)Light up the candle and see the light thought the holes. You will see that it is coming in a straight line and is clearly visible.

5)Then move any one of the cardboard slightly from it's postition and then you will see that you can't observe the light that was earlier visible as the 3 holes were not in straight line now.

THIS PROVES LINE TRAVELS IN A STRAIGHT LINE.

thanks

Answer 2

Answer:

Aim:To show that rectilinear propagation of light.

Materials Required:Three cardboards ,candle and Matchbox.

procedure:

1.Take three cardboards and label them as A,B,C.

2.Make a small hole at the centre of each cardboard.

3.Keep the cardboards vertically so that the three holes are in a straight line .

4. Now lit the candle with the matchbox .

5.place a lighted candle near the hole of cardboard A and bring your eye near the hole of cardboard C.Observe what happens.

6.Now place the cardboard B in such a way that the board's are not in a straight line and observe.

Observation:

.this shows that light travels in a straight line