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Question
How is the refractive index of a medium related to the speed of light in it?
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Solution
Denser medium has a higher refractive index and therefore the speed of light in such medium is lower in comparison to the speed of light in a medium which has a lower refractive index.
RELATED QUESTIONS
A student very cautiously traces the path of a ray through a glass slab for different values of the angle of incidence (∠i). He then measures the corresponding values of the angle of refraction (∠r) and the angle of emergence (∠e) for every value of the angle of incidence. On analysing these measurements of angles, his conclusion would be
(A) ∠i > ∠r > ∠e
(B) ∠i = ∠e > ∠r
(C) ∠i < ∠r < ∠e
(D) ∠i = ∠e < ∠r
Explain the term absolute refractive index of a medium and write an expression to relate it with the speed of light in vacuum.
Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minimum deviation
Draw diagrams to show the refraction of light from
- air to glass, and
- glass to air. In each diagram, label the incident ray, refracted ray, the angle of incidence
- and the angle of refraction (r).
Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature, the glass piece is not seen.
Why is the light of a single colour used ?
Why is the colour red used as a sign of danger?
State the factors on which the angle of deviation depends.
The refractive index of air with respect to glass is defined: as gµa = sin i/sin r
If r = 90°, what is the corresponding angle i called?
Draw ray of light bending towards the normal while passing from air to glass. Label your diagrams.
How will you verify the laws of refraction or how the refractive index of glass is determined in the laboratory?
