2 marksShort AnswerSection A

The refractive indices of glass and water with respect to air are $3/2$ and $4/3$ respectively. If speed of light in glass is $2 \times 10^8$ m/s, find the speed of light in water.

Light — Reflection and Refraction

Refraction

Official Answer

$\frac{8}{3} \times 10^8$ m/s

Speed of light in waterRefractive index of water with respect to airRefractive index of glass with respect to airSpeed of light in glass

Marking Scheme

11 mark for the correct answer
21 mark for the correct calculation

Hint

["Use the concept of refractive index to solve this problem.", "The refractive index of a medium is equal to the ratio of the speed of light in air to the speed of light in the medium."]

Quick Oral Answer

The speed of light in water is $\frac{8}{3} \times 10^8$ m/s.

Analysis & Explanation

["The problem requires us to find the speed of light in water given the refractive indices of glass and water with respect to air, and the speed of light in glass.", "We can use the concept of refractive index to solve this problem.", "The refractive index of a medium is equal to the ratio of the speed of light in air to the speed of light in the medium.", "We can use this concept to calculate the speed of light in water."]

Common Mistakes

1Incorrect calculation of the speed of light in water
2Incorrect use of the refractive index formula

Interesting Facts

The refractive index of a medium is a measure of how much it bends light.

The speed of light in a medium is inversely proportional to its refractive index.

Spotted a mistake or something unclear?

Tell us — we fix reported answers fast.

Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2016?

This question carries 2 marks in the CBSE Class 10 Science 2016 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Light — Reflection and Refraction" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

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

What type of question is this in the CBSE Class 10 Science 2016 paper?

This is a Short Answer question from Section A in the CBSE Class 10 Science 2016 paper.