The values of absolute refractive indices of kerosene and water are 1.44 and 1.33 respectively. Compare the two media on the basis of their
(a) optical density
(b) mass density
(c) relative speed of propagation of light.
What do you infer on the basis of above comparisons?
The values of absolute refractive indices of kerosene and water are 1.44 and 1.33 respectively. Compare the two media on the basis of their
(a) optical density
(b) mass density
(c) relative speed of propagation of light.
What do you infer on the basis of above comparisons?
(a) Kerosene is optically denser than water.
(b) Mass density of kerosene is less than that of water.
(c) Speed of light in kerosene is less than that in water.
Marking Scheme
- 12 marks
Hint
Recall the definitions of absolute refractive index, optical density, and mass density.
Quick Oral Answer
Kerosene is optically denser than water because it has a higher absolute refractive index. The mass density of kerosene is less than that of water. The speed of light in kerosene is less than that in water because it has a higher refractive index.
Analysis & Explanation
The absolute refractive index of a medium is a measure of how much it bends light. A higher refractive index means that the medium bends light more, and is therefore optically denser. The mass density of a medium is a measure of its mass per unit volume, and is not directly related to its refractive index. The speed of light in a medium is inversely proportional to its refractive index, so a higher refractive index means a lower speed of light.
Common Mistakes
- 1thinking that optical density is the same as mass density
Interesting Facts
The absolute refractive index of a medium is a measure of how much it bends light.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2025?
This question carries 2 marks in the CBSE Class 10 Science 2025 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 "Reflection and Refraction" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2025 paper?
This is a Very Short Answer question from Section B in the CBSE Class 10 Science 2025 paper.