Concept of Refractive Index of an Optical Medium | Class 10 Physics 2022-23

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Published on September 3, 2020 8:15:10 AM ● Video Link: https://www.youtube.com/watch?v=bkyqb2Zs-yY

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✅ In this video,

✔️ Class: 10th
✔️ Subject: Physics
✔️ Chapter: Light: Reflection And Refraction (Chapter 10)
✔️ Topic Name: Concept of Refractive Index of An Optical Medium - Light: Reflection And Refraction | Class 10 Physics Chapter 10 (2022-23)
✔️ Topics Covered In This Video (by Vibhuti Ma'am): This YouTube video will explain the concept of the refractive index of an optical medium for Class 10 Science in the 2022-23 academic year. It will focus on how light refracts and reflects in this type of medium, and be presented by Vibhuti Mam. This video will be a great resource for students preparing for their upcoming exams, as well as those looking to enhance their knowledge in this particular field.
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00:00 Introduction: Light: Reflection And Refraction
00:08 Concept of Refractive Index of An Optical Medium
25:32 Website Overview
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Points covered in this video:-

Concept of Refractive Index of an Optical Medium -
- The (absolute) refractive index of a medium is defined as the ratio of speed of light in vacuum the speed of light in the medium.
- It is represented by n.
- (Absolute) refractive index of a medium
- As the speed of light in air is almost equal to the speed of light in vacuum. Therefore, (absolute) refractive index of a medium.

- As in vacuum or air (i.e., free space), speed of light (for all wavelength) is maximum, and equal to c, therefore, refractive index of free space (air or vacuum) is minimum.
nfree space = c/v = c/c = 1

- As refractive index is a ratio of two velocities, it has no units. It is a pure number.

- A medium with higher value of refractive index is said to be optically denser compared to a medium with lower value of refractive index.

- As nglass = 3/2 and nwater = 4/3, therefore, both glass and water are optically denser compared to air or vacuum.

- Further, glass is optically denser compared to water.

- And water is optically denser compared to air, but water is optically rarer compared to glass.
v = c/n

- Larger the value of n, smaller is the value of v.

- It means in a denser medium, speed of light is smaller and in a rarer medium, the speed of light is larger.

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