Question

what is rectilinear propagation of light? Give an example of a device which works on this principle.​

Answer 1

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Rectilinear propagation of light is the property of light due to which it travels in a straight line.Another example of rectilinear propagation of light involves the formation of shadows. When you place an object in front of a candle, you will see its shadows on the wall. It is because light travels along a straight line and leaves only the areas where the object interferes.

Answer 2

Answer:

Rectilinear Propagation of Light describes that Light travels in a Straight Line. A mirror changes the direction of Light that falls on it and it travels in a Straight line Path. Reflection of Light occurs when light bounces off a polished surface.

Experimental verification of light travelling in staright line and reflects from mirror.

Fix a comb on one side of a large thermocol sheet and fix a mirror on the other side as shown in Fig. Spread a dark colored sheet of paper between the mirror and the comb. Keep this in sunlight or send a beam of light from a torch through the comb.We will observe that light gets reflected from mirror and travels in straight line (from figure).

LIGHT MAKES THINGS VISIBLE AND TRAVELS IN STRAIGHT LINE - SHORTCUT



When light falls on any object and the object reflects that light than only we are able to see the particular objects. As there is no particles in the space, light doesn't get reflected because of which space is seen black.

Take a comb and fix it on one side of a wooden block. Fix a mirror on the other side as shown in the figure. Spread a dark coloured sheet of paper between the mirror and the comb. Send a beam of light from a torch through the comb. You get a pattern of light similar to that shown in the figure. This activity explains the manner in which light travels and gets reflected from a mirror.