Advertisements
Advertisements
प्रश्न
A beam of light consisting of red, green and blue is incident on a right-angled prism as shown in figure. The refractive index of the material of the prism for the above red, green and blue colours are 1.39, 1.44 and 1.47 respectively. What are the colours suffer total internal reflection?
Advertisements
उत्तर
i > c ∴ i = 45°
`mu = 1/(sin "c")`
sin c = `1/mu`
- Red-
`"C"_"R" = sin^-1 (1/mu)`
`= sin^-1 (1/1.39)`
CR ≈ 46°
i = 45°
i < CR
- Green-
`"C"_"G" = sin^-1 (1/mu)`
`= sin^-1 (1/1.44)`
CG ≈ 44°
i = 45°
i > CG
- Blue-
`"C"_"B" = sin^-1 (1/mu)`
`= sin^-1 (1/1.47)`
CG ≈ 43°
i = 45°
i > CB
Green and blue suffer total internal reflection.
APPEARS IN
संबंधित प्रश्न
What is the advantage of using a polygonal mirror with larger number of faces in Michelson method of measuring the speed of light?
The speed of light is 299, 792, 458 ms−1
(a) with respect to the earth
(b) with respect to the sun
(c) with respect to a train moving on the earth
(d) with respect to a spaceship going in outer space.
Which of the following methods can be used to measure the speed of light in laboratory?
Which of the following methods can be used to measure the speed of light in water?
What is the speed of light in a denser medium of polarizing angle 30?
If the velocity and wavelength of light in air is Va and λa and that in water is Va and λw, then the refractive index of water is ______.
| A ray of light travels from a denser to a rarer medium. After refraction, it bends away from the normal. When we keep increasing the angle of incidence, the angle of refraction also increases till the refracted ray grazes along the interface of two media. The angle of incidence for which it happens is called critical angle. If the angle of incidence is increased further the ray will not emerge and it will be reflected back in the denser medium. This phenomenon is called total internal reflection of light. |
The critical angle for a pair of two media A and B of refractive indices 2.0 and 1.0 respectively is:
| A ray of light travels from a denser to a rarer medium. After refraction, it bends away from the normal. When we keep increasing the angle of incidence, the angle of refraction also increases till the refracted ray grazes along the interface of two media. The angle of incidence for which it happens is called critical angle. If the angle of incidence is increased further the ray will not emerge and it will be reflected back in the denser medium. This phenomenon is called total internal reflection of light. |
The critical angle of the pair of a medium and air is 30°. The speed of light in the medium is:
A ray of light of wavelength 600 nm propagates from air into a medium. If its wavelength in the medium becomes 400 nm, the refractive index of the medium is ______.
A ray of light travels a distance of 12.0 m in a transparent sheet in 60 ns. The refractive index of the sheet is ______.
