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प्रश्न
How is the critical angle of a material related to its refractive index?
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उत्तर
Relation of critical angle and refractive index:
μ = `1/sin "C"`
Where μ = refractive index of the material and C = critical angle.
संबंधित प्रश्न
In the given figure PQ and PR are the two light rays emerging from an object P. The ray PQ is refracted as QS.
- State the special name given to the angle of incidence ∠PQN of the ray PQ.
- What is the angle of refraction for the refracted ray QS?
- Name the phenomenon that occurs if the angle of incidence ∠PQN is increased.
- The ray PR suffers partial reflection and refraction on the water-air surface. Give reason.
- Draw in the diagram the refracted ray for the incident ray PR and hence show the position of image of the object P by the letter P’ when seen vertically from above.
Prove the statement.
A rainbow is the combined effect of the refraction, dispersion, and total internal reflection of light.
i) Observe the given figure and answer the following questions.
a) Identify and write the natural process shown in the figure.
b) List the phenomena which are observe in this process.
c) Redraw the diagram and show above phenomena in it.
The observation made by Swarali while doing the experiment is given below. Based on these write answers to the questions:
Swarali found that the light ray travelling from the denser medium to rarer medium goes away from the normal. If the angle of incidence (i) is raised by Swarali, the angle of refraction (r) went on increasing. However, after certain value of the angle of incidence the light ray is seen to return back into the denser medium.
Questions:
- What is the specific value of∠i called?
- What is the process of reflection of incident rays into denser medium called?
- Draw the diagrams of three observations made by Swarali.
The twinkling effect of star light is due to ______.
What are the conditions to achieve total internal reflection?
A Rainbow is a beautiful natural phenomenon formed because of the following:
Find the value of θ in the given figure.
The critical angle for crown glass, which has a refractive index of 1.52, is:
