Q11
1 markMCQSection A

Absolute refractive index of glass and water is 32\frac{3}{2} and 43\frac{4}{3} respectively. If the speed of light in glass is 2×108 m/s2 \times 10^{8} \mathrm{~m} / \mathrm{s}, the speed of light in water is :

The Human Eye and the Colourful World
Refraction of Light

Options

(A)94×108 m/s\frac{9}{4} \times 10^{8} \mathrm{~m} / \mathrm{s}
(B)52×108 m/s\frac{5}{2} \times 10^{8} \mathrm{~m} / \mathrm{s}
(C)73×108 m/s\frac{7}{3} \times 10^{8} \mathrm{~m} / \mathrm{s}
(D)169×108 m/s\frac{16}{9} \times 10^{8} \mathrm{~m} / \mathrm{s}
Official Answer

94×108 m/s\frac{9}{4} \times 10^{8} \mathrm{~m} / \mathrm{s}

speed of lightrefractive indexglasswater

Marking Scheme

  • 11 mark

Hint

Use the formula for absolute refractive index and the relationship between the speed of light in a medium and its refractive index.

Quick Oral Answer

The speed of light in water is 94×108 m/s\frac{9}{4} \times 10^{8} \mathrm{~m} / \mathrm{s}.

Analysis & Explanation

The question requires the use of the formula for absolute refractive index and the relationship between the speed of light in a medium and its refractive index. The correct answer is 94×108 m/s\frac{9}{4} \times 10^{8} \mathrm{~m} / \mathrm{s}, which is option A.

Common Mistakes

  1. 1Using the wrong formula or incorrect values for the refractive indices.

Interesting Facts

The speed of light in a vacuum is approximately 3×108 m/s3 \times 10^{8} \mathrm{~m} / \mathrm{s}.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2024?

This question carries 1 mark in the CBSE Class 10 Science 2024 examination.

Which chapter does this question come from in Science?

This question is from the chapter "The Human Eye and the Colourful World" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Refraction of Light" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2024 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2024 paper.