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Question

Figure

(a) How does the above experiment show that light travels in a straight line?
(b) Think and write about two everyday situations that tell you that light travels in a straight line.

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Solution

(a) In this experiment, flame is seen only when the holes are exactly in a straight line. If any of the holes fail to come in line with the others, flame cannot be seen. This proves that light travels in a straight line.

(b) Shadows are formed because light travels in a straight line. In a pinhole camera, the image is formed because light travels in a straight line.

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