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प्रश्न
State two advantages of using a right-angle prism as a reflector, rather than a plane mirror.
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उत्तर
(i) There is no absorption of light in a prism and hence the image is brighter.
(ii) Image is sharper in case of the prism.
संबंधित प्रश्न
Which colour of light has a higher critical angle? Red light or green light.
What is total internal reflection?
Define critical angle for a given medium.
How does a ray of light bend when it travels from rarer to denser medium
Choose the correct option.
Angles of deviation for extreme colours are given for different prisms. Select the one having maximum dispersive power of its material.
Answer the following question.
Under what conditions are total internal reflection possible? Explain it with a suitable example.
Solve Numerical example.
A monochromatic ray of light is incident at 37° on an equilateral prism of refractive index 3/2. Determine angle of emergence and angle of deviation. If angle of prism is adjustable, what should its value be for emergent rays to be just possible for the same angle of incidence?
Critical angle of light passing from glass to air is maximum for ____________.
For total internal reflection to take place, the angle of inddence i and the refractive index µ of the medium must satisfy the inequality ____________.
- 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.
