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प्रश्न
Choose the correct option.
Consider the following phenomena/ applications: P) Mirage, Q) rainbow, R) Optical fibre and S) glittering of a diamond. Total internal reflection is involved in
विकल्प
Only R and S
Only R
Only P, R and S
all the four
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उत्तर
Only R and S
APPEARS IN
संबंधित प्रश्न
You are given prisms made of crown glass and flint glass with a wide variety of angles. Suggest a combination of prisms which will
(a) deviate a pencil of white light without much dispersion,
(b) disperse (and displace) a pencil of white light without much deviation.
Name the factors affecting the critical angle for the pair of media.
The figure shows a ray of light falling normally on the face AB of an equilateral glass prism having refractive index`3/2`, placed in water of refractive index `4/3`.Will this ray suffer total internal reflection on striking the face AC? Justify your answer.
Which colour of light has a higher critical angle? Red light or green light.
A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incident is ______.
Total internal reflection occurs only when a ray of light passes from a ______ medium to a ______ medium.
Two isosceles right-angle glass prisms P and Q are placed near each other as shown in Fig. Complete the path of the light ray entering the prism P till it emerges out of the prism Q.
Calculate the speed of light in a medium whose critical angle is 30° ?
Prove the statement.
A rainbow is the combined effect of the refraction, dispersion, and total internal reflection of light.
Plot a graph between
Sine of angle of incidence versus sine of angle of refraction,
Make the correct choices for each of the following :
Total Internal reflection takes place when
(where ∠i = angle of incidence, ∠r = angle of refraction, ∠C = critical angle)
In the following figure, show two rays A and B travelling from water to air. If the critical angle for water- air surface is 48°, complete the ray diagram showing the refracted rays for each. State conditions when the ray will suffer total internal reflection.
Express the refractive index μ of a medium in terms of the angle of incidence i in air and the angle of refraction r in a denser medium.
How are critical angles related to the refractive index of the medium?
Complete the following diagram to show the path of the ray of a single colour in the diagram as if enters in and emerges out of the prism. Mark the angles wherever necessary. (Critical angle for glass = 42°).
Explain ‘mirage’ as an illustration of refraction.
Answer the following question.
What are the advantages of optical fibre communication over electronic communication?
A green light is incident from the water to the air-water interface at the critical angle (C). Select the correct statement.
For the same angle of incidence, the angle of refraction in four media A, B, C and D are 25°, 30°, 35° and 40° respectively. The speed of light is least in medium ______.
A particle is projected such that the horizontal range and vertical height are equal. Then the angle of projection is :
The outer concentric shell in optic fiber is called ______.
What is a mirage? How does it occur?
A green light is incident from the water to the air-water interface at the critical angle (θ). Select the correct statement.
The phenomena involved in the reflection of radiowaves by ionosphere is similar to ______.
State the condition under which total internal reflection occurs. Give the mathematical expression for total internal reflection.
A Rainbow is a beautiful natural phenomenon formed because of the following:
Observe the given figure of the raindrop and answer the following questions:
- Label A and B of the given diagram. Why colour will deviate most.
- Name the phenomenon shown in label C.
- Assertion (A): Propagation of light through an optical fibre is due to total internal reflection taking place at the core-cladding interface.
- Reason (R): Refractive index of the material of the cladding of the optical fibre is greater than that of the core.
