Question

With the aid of a diagram discuss the rectilined propagation of light

Answer 1

Answer:

Rectilinear propagation of light is the natural phenomenon of light that causes it to travel in a straight line without hindrance. When the path is blocked by solid or opaque objects, light cannot travel through, and thus, there will be shadows.

Some natural examples of the rectilinear propagation of light are:

• the solar eclipse where when the moon comes between the sun and the moon, the moon covers the path of light from the sun and thus it casts a shadow.
• when you stand in front of a mirror, you can see yourself which is also because of the reflection of light on the mirror.
• if a stick is put in water, the part which is inside water appears to be bent but is still visible.

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ACTIVITY (refer to the image below)

Aim: To verify that light travels in a straight line.

Materials needed: A flexible rubber or plastic tube/straw of length 10 inches (used for drinking cold drinks), and a light bulb/candle/lamp.

(Note: Do not use sunlight as the source of light in this experiment as it could hurt your eyes.)

Method: Hold the tube absolutely straight and point one open end to the source of light. Put your eye to the other hole. What do you see? Now bend the tube and look through the hole. What do you see this time?

Observation: When the tube is held straight, the source of light can be seen. However, when the tube is bent, the source of light cannot be seen.

Conclusion: This indicates that light travels in a straight line.

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