Daily Practice Questions (Part-5) - Light: Reflection And Refraction | Class 10 Physics 2022-23

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✅ In this video,

✔️ Class: 10th
✔️ Subject: Physics
✔️ Chapter: Light: Reflection And Refraction (Chapter 10)
✔️ Topic Name: Daily Practice Questions (Part 5) - Light: Reflection And Refraction | Class 10 Physics Chapter 10 (2022-23)
✔️ Topics Covered In This Video (by Vibhuti Ma'am): This video covers Daily Practice Questions from Class 10 Science, Chapter 10 - Light: Reflection and Refraction (2022-23). The session is conducted by Ms. Vibhuti Mam, who is an experienced and respected teacher for students of class 10th studying CBSE Board 2021-22. In this video, she will go through important and most expected questions from the chapter, light reflection and refraction. It will help students gain better understanding of the subject, develop confidence, and solve the questions in the examinations with ease.
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00:00 Introduction: Light: Reflection And Refraction
00:07 Daily Practice Questions
43:43 Website Overview
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Points covered in this video:-

Daily Practice Questions -
1. Light travels through water with a speed of 2.25 x 108 m/s. What is the refractive index of water? Given speed of light in vacuum = 3 x 108 m/s.
a. 1.34
b. 1.33
c. 1.23
d. 1.50

Solution 1. Here,
Speed of light in water, v = 2.25 x 108 m/s
Speed of light in vacuum, c = 3 x 108 m/s,
Refractive index, n = ?
n = c/v
n = 3 x 108 / 2.25 x 108
n = 1.33

2. How much time will light take to cross 2 mm thick glass pane if refractive index of glass is 3/2?
a. 1010
b. 10-10
c. 1011
d. 10-11

Solution 2. Here,
t = ?
x = 2 mm = 2 x 10-3 m
n = 3/2
From, n = c/v
v = c/n = 3 x 108 / (3/2) = 2 x 108 m/s
t = x / v = 2 x 10-3 / 2 x 108 = 10-11 s.

3. Calculate speed of light in water of refractive index 4/3. Given speed of light in air = 3 x 108 m/s.
a. 1.25 x 108 m/s
b. 2.25 x 108 m/s
c. 2.25 x 105 m/s
d. 1.25 x 105 m/s

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