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प्रश्न
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.
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उत्तर
(a) Diagram showing complete path of light :
(b) Angle of incidence and angle of refraction marked in the above diagram.
R.I = `"sin i"/"sin r"`
(c) Angle of emergence is marked in the above diagram.
Angle of incidence = Angle of emergence
(d) Rays IO and O'E are parallel to each other. These are incident and emergent rays respectively.
(e) In the diagram above, the lateral displacement is indicated by XY.
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संबंधित प्रश्न
Explain how the formation of a rainbow occurs.
Draw a ray diagram to show the refraction of light through a glass slab and mark angle of refraction and the lateral shift suffered by the ray of light while passing through the slab.
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
The speed of light in glass is 2 × 105 km/s. What is the refractive index of glass?
Which colour of light travels fastest in any medium except air?
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(A) ∠i only
(B) ∠i and ∠r
(C) ∠i and ∠e
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