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प्रश्न
State the relation between the critical angle and the absolute refractive index of a medium.
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उत्तर
`mu = 1/(sin c)` or `sin c = 1/mu`where ‘c’ is the critical angle and ‘μ’ is the absolute refractive index.
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संबंधित प्रश्न
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.
Define critical angle for a given medium.
Plot a graph between
Angle of incidence versus angle of reflection,
How does a ray of light bend when it travels from when it is normal to the interface of the two media.
How are critical angles related to the refractive index of the medium?
A ray of light passes through a right-angled prism as shown in the figure. State the angles of incidence at the faces AC and BC.
A spherical marble, of refractive index 1.5 and curvature 1.5 cm, contains a tiny air bubble at its centre. Where will it appear when seen from outside?
Describe the construction and working of an optical fibre.
What are the conditions to achieve total internal reflection?
