Advertisements
Advertisements
प्रश्न
How are critical angles related to the refractive index of the medium?
उत्तर
APPEARS IN
संबंधित प्रश्न
Name two factors which affect the critical angle for a given pair of media. State how do the factors affect it.
Write the necessary conditions for the phenomenon of total internal reflection to
occur ?
Prove the statement.
A rainbow is the combined effect of the refraction, dispersion, and total internal reflection of light.
Solve the previous problem if the paperweight is inverted at its place so that the spherical surface touches the paper.
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.
How does a ray of light bend when it travels from rarer to denser medium
Draw a diagram, properly labelled, to illustrate the use of a total reflecting prism (a right-angled isosceles prism) to turn a ray of light through 180°. Name an instrument in which this device is used.
For a ray of light, the critical angle is minimum when it travels from ______.
Define the critical angle.
- 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.
