NCERT Exercise (Part 2) - Light: Reflection And Refraction | Class 10 Physics 2022-23
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In this video,
โ๏ธ Class: 10th
โ๏ธ Subject: Physics
โ๏ธ Chapter: Light: Reflection And Refraction (Chapter 10)
โ๏ธ Topic Name: NCERT Exercise (Part 2) - Light: Reflection And Refraction | Class 10 Physics Chapter 10 (2022-23)
โ๏ธ Topics Covered In This Video (by Vibhuti Ma'am): In this video, Vibhuti Mam will cover the topic of Light: Reflection and Refraction from NCERT Exercise for Class 10 Physics Chapter 10. Get ready to learn the essential concepts of reflection and refraction in a fun and interactive way and understand their application for the upcoming academic year 2022-23. Brush up on key topics like plane mirrors, spherical mirrors, image formation by plane mirrors, refraction through glass, refractive index and much more. Don't miss this opportunity to strengthen your fundamentals of Reflection and Refraction and ace your exams!
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00:00 Introduction: Light: Reflection And Refraction
00:05 Question 1 to 7: NCERT Exercise of Light: Reflection And Refraction
Question. 1. A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
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Points covered in this video:-
Question. 1. A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
Solution. The ray of light bends towards the normal. When a ray of light enters from an optically rarer medium (having low refractive index) to an optically denser medium (having high refractive index), its speed slows down and it bends towards the normal. Since water is optically denser than air, a ray of light entering from air into water will bend towards the normal.
Question. 2. Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 ร 108 m sโ1 .
Solution. Refractive index of a medium, nm = Speed of light in vacuum/Speed of light in medium
Speed of light in vacuum, c = 3 x 108 ms-1
Refractive index of glass, ng = 1.50
Speed of light in the glass, v = Speed of light in vacuum/Refractive index of glass
= c/ng
= 3 x 108/ 1.50
= 2 x 108 ms-1
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