CBSE Class 10 Science 2020 Outside Delhi Set 2

Question : 4

Total: 7

(a) Water has refractive index 1.33 and alcohol has refractive index 1.36. Which of the two medium is optically denser? Give reason for your answer.
(b) Draw a ray diagram to show the path of a ray of light passing obliquely from water to alcohol.
(c) State the relationship between angle of incidence and angle of refraction in the above case.

Solution:

(a) Refractive index of alcohol > refractive index of water. So, alcohol is optically denser than water. When a ray of light enters from water to alcohol, it bends towards the normal. Greater the refractive index denser the liquid or material.

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