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प्रश्न
Draw the ray diagram of a glass slab having medium A and B for the velocity of light ray VA and VB respectively and define Snell's law.
- If VB = 1.5 VA, then which medium is denser?
- What is the refractive index of A with respect to B?
- What is the refractive index of B with respect to A?
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उत्तर
Where i = angle of incidence,
r = angle of refraction,
e = angle of emergence
At point N, using snell's law
AηB = `sin "i"/sin "r"` = constant
According to snell's law, the sin i of the angle of incidence to the sin r of the angle of refraction is always constant.
- Medium A is denser.
- Refractive index of A with respect to B is:
BηA = `"V"_"B"/"V"_"A" = (1.5 "V"_"A")/"V"_"A" = 3/2` - Refractive index of B with respect to A is:
AηB = `1/(""_"B"η_"A") = 2/3`
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संबंधित प्रश्न
In your laboratory you trace the path of light rays through a glass slab for different values of angle of incidence (∠i) and in each case measure the values of the corresponding angle of refraction (∠r) and angle of emergence (∠e). On the basis of your observations your correct conclusion is:
(a) ∠i is more than ∠r, but nearly equal to ∠e
(b) ∠i is less then ∠r, but nearly equal to ∠e
(c) ∠i is more than ∠e, but nearly equal to ∠r
(d) ∠i is less than ∠e, but nearly equal to ∠r
Study the following four experimental set-ups I, II, III and IV for the experiment, "To trace the path of a ray of light through a rectangular glass slab."
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(A) I
(B) II
(C) III
(D) IV
Name one factor that affects the lateral displacement of light as it passes through a rectangular glass slab.
Draw the diagram of refraction of light in the glass slab
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In each case, draw diagram to show the path taken by the ray as it passes through the glass block and emerges from it.
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Fill in the blanks to complete the following sentence
When light travels from a denser to a rarer medium, its speed ……………….
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- In the diagram show the approximate direction of these rays as they emerge out of the block.
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A total reflecting right angled isosceles prism can be used to deviate a ray of light through:
(a) 30° (b) 60° (c) 75° (d) 90°.
Select from the following the best experimental set-up for tracing the path of a ray of light through a glass slab:
(A) I
(B) II
(C) III
(D) IV
In the fig. name the ray which represents the correct path of light while passing through a glass block.
In the fig., PO is a ray of light incident on a rectangular glass block.
(a) Complete the path of the ray through the block.
(b) In the diagram, mark the angle of incidence (i) and the angle of refraction (r) at the first interface. How is the refractive index of glass related to the angles I and r?
(c) Mark angle of emergence by the letter e. How are the angles i and e related?
(d) Which two rays are parallel to each other? Name them.
(e) Indicate in the diagram the lateral displacement between the emergent ray and the incident ray.
In an experiment of finding the refractive index of glass, if blue light is replaced by the red light, how will the refractive index of glass change? Give reason in support of your answer.
Draw a ray diagram showing the lateral displacement of a ray of light when it passes through a parallel sided glass slab.
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Write down a similar expression for aµg in terms of angle i and r.
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How will you verify the laws of refraction or how the refractive index of glass is determined in the laboratory?
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(a) Does the light speed up or slow down in the glass,
(b) Give the reason for your answer.
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