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Light travels in a Straight Line Video Lecture | Science Olympiad Class 7

FAQs on Light travels in a Straight Line Video Lecture - Science Olympiad Class 7

1. What is the principle behind light traveling in a straight line?

Ans. The principle that light travels in a straight line is known as the "rectilinear propagation of light." This means that when light travels in a uniform medium, it follows a straight path unless it encounters an obstacle or a different medium, which can cause it to bend or change direction.

2. How does the concept of light traveling in a straight line apply to everyday life?

Ans. In everyday life, we observe light traveling in straight lines when we see shadows or when we look at objects illuminated by a light source. For example, when sunlight passes through a narrow gap, it creates sharp shadows on the ground, demonstrating that light travels in straight lines.

3. What are some experiments that demonstrate light traveling in a straight line?

Ans. One common experiment is using a laser pointer. When the laser beam is directed at a wall or a surface, it creates a straight line of light. Another example is the use of a pinhole camera, which shows how light travels in straight lines to create an image on a screen.

4. Why do we see the bending of light when it passes through different media, such as air to water?

Ans. The bending of light when it passes from one medium to another, like air to water, is called refraction. This occurs because light travels at different speeds in different materials. When light enters a denser medium, it slows down and bends towards the normal line; when it exits into a less dense medium, it speeds up and bends away from the normal line.

5. Can light travel through a vacuum, and if so, what does that imply about its straight-line travel?

Ans. Yes, light can travel through a vacuum, which means it can move in a straight line without any obstacles. This property is essential for understanding how we receive light from distant stars and galaxies, as space is mostly a vacuum where light travels freely and straight to reach us.

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Sep 24, 2025 Last updated

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	Science Olympiad Class 7 49 videos\|125 docs\|45 tests

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49 videos|125 docs|45 tests

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