Advertisements
Advertisements
Question
Which colour of light travels fastest in any medium except air?
Advertisements
Solution
Red colour travels the fastest as its wavelength is the highest.
APPEARS IN
RELATED QUESTIONS
What is a spectrum?
Explain the term absolute refractive index of a medium and write an expression to relate it with the speed of light in vacuum.
Write the relation between the angle of incidence and the angle of refraction for a medium.
For which colour of white light, is the refractive index of a transparent medium the most?
The refractive index of glass is 1.5. From a point P inside a glass block, draw rays PA, PB and PC incident on the glass air surface at an angle of incidence 30°, 42° and 60° respectively.
- In the diagram show the approximate direction of these rays as they emerge out of the block.
- What is the angle of refraction for the ray PB?
`("Take" sin 42° =2/3)`
Fig. shows a ray of white light that passes through a prism and produces a spectrum.
(a) Name the phenomenon that is taking place.
(b) What colour would you see at X and Y?
(c) What radiation would you detect above X and below Y?
Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature, the glass piece is not seen.
Why is the light of a single colour used ?
Why is the colour red used as a sign of danger?
In what condition a prism is said to be in the position of minimum deviation? What is the direction of the refracted ray inside the prism in this condition?
