Physics Light Part 18 (Question 1) Class 8 VIII | Summary and Q&A

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November 2, 2015
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Physics Light Part 18 (Question 1) Class 8 VIII

TL;DR

This video discusses the concepts of regular and diffused reflection, the laws of reflection, and the behavior of light in different surfaces.

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Questions & Answers

Q: Can objects be seen in a dark room?

No, objects cannot be seen in a dark room because light is essential for us to see. Only when there is light present and reflection of light occurs, can we see objects.

Q: What is the difference between regular and diffused reflection?

Regular reflection occurs from smooth surfaces and allows for proper image formation, while diffused reflection occurs from rough surfaces and scatters the reflected rays, preventing image formation.

Q: Which objects exhibit regular reflection, and which show diffused reflection?

Mirror exhibits regular reflection, while polished wooden tables, chalk powder, rough cardboard surfaces, and marble floors with water spread over them exhibit diffused reflection.

Q: What are the laws of reflection?

The laws of reflection state that the incident ray, reflected ray, and normal all lie in the same plane, and the angle of incidence is equal to the angle of reflection.

Summary & Key Takeaways

  • The presence of light enables us to see objects, and without light, objects cannot be seen in a dark room. Reflection of light occurs when light hits an object and the reflected rays reach our eyes.

  • Regular reflection occurs from smooth surfaces, while diffused reflection occurs from rough surfaces. In regular reflection, proper image formation takes place, but in diffused reflection, the reflected rays scatter in different directions, preventing image formation.

  • The laws of reflection remain consistent for all types of surfaces, but the direction of the reflected rays differs in diffused reflection due to the different normals at each point on a rough surface.

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