# Light: Refraction || CBSE Class 10 Science - Board Brahmastra || Don't Memorise | Summary and Q&A

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December 30, 2022
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Infinity Learn NEET
Light: Refraction || CBSE Class 10 Science - Board Brahmastra || Don't Memorise

## TL;DR

Learn about refraction of light and the different types of spherical lenses, including convex and concave lenses.

## Key Insights

• 🙂 Refraction of light is the bending of light when it passes from one medium to another, and it is caused by a change in the speed of light.
• 🙂 Convex lenses are thicker at the center and converge light, while concave lenses are thinner at the center and diverge light.
• 🙂 The refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in that medium.

## Transcript

hello everyone hi my name is Akash and today we are starting the second session of physics for board brahmastra okay there's our new series only for grade 10. so if you are in grade 10. I'll be just recently website and get the schedule I think science is on 4th March TK hi everyone Chalo let's start with quickly revised questions and then we'll st... Read More

### Q: What is refraction of light?

Refraction of light is the bending of light when it travels from one medium to another, caused by a change in its speed.

### Q: What is the difference between convex and concave lenses?

Convex lenses are thicker at the center and converge parallel rays of light, while concave lenses are thinner at the center and diverge parallel rays of light.

### Q: How is the refractive index defined?

The refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in that medium.

### Q: What are the main assumptions made when studying spherical lenses?

The main assumptions made are that the radii of curvature of the two lens surfaces are equal, and that the lenses are thin.

## Summary & Key Takeaways

• The content provides an introduction to the concepts of refraction of light and spherical lenses.

• It explains the basic principles of refraction, including the laws of refraction and the concept of refractive index.

• It introduces the two types of spherical lenses - convex and concave - and discusses their properties.