What does these lines mean- the fact that a small source of light casts a sharp shadow of an opaque object points to this straight line path of light, usually indicated as a ray of light.

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Solution

experiment to show light travels in straight lines.
Take 3 card boards.light a candle.Make a pinhole in center and place it in a line.

Try to see the candle light from the one pinhole. If all pinholes are linear, you will be able to see the flame.

But if the middle card is moved little bit,you wont be able to see the flame.

this means light travell in straight line.

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Similar questions

A circular object when kept between a small source of light and a screen, casts a sharp shadow on the screen.

This experiment proves:

A circular object when kept between a small source of light and a screen, casts a sharp shadow on the screen. What could be the phenomenon responsible?

Cathode rays can cast shadow of opaque objects placed in their path.

Q. Shadows are formed when an opaque object comes in the path of light.

Q. Which of these will form a darkest shadow?
(a) opaque object
(b) transparent object
(c) translucent object
(d) cannot say because it depends on the source of light

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