Physics
White light is dispersed by a prism. Inside the prism, compared to the blue light, the red light
- slows down less and refracts more
- slows down more and refracts less
- slows down more and refracts more
- slows down less and refracts less
Answer
slows down less and refracts less
Reason — In a prism, the refractive index of a given transparent medium decreases with the increase in the wavelength of light. Thus, for visible light the refractive index of the material of a prism is greater for blue colour and minimum for red colour i.e., speed of red colour is greater than speed of blue colour. Consequently, a given prism deviates blue light more as compared to red light.
Related Questions
For burning of coal in a thermoelectric station, the energy conversion taking place is :
- chemical to heat to mechanical
- chemical to heat to mechanical to electrical
- chemical to heat to light
- heat to chemical to mechanical
The adjacent diagram shows the movable block of a block and tackle system with effort in a convenient direction. From the diagram we can conclude that the number of pulleys used in the fixed block are …………… .
- 1
- 3
- 2
- 4
An endoscope uses optic fiber to transmit high resolution images of internal organs without loss of information. The principle of light that is used by the optic fiber is based on :
- refraction
- reflection
- scattering
- total internal reflection
A convex lens has focal length 12 cm with an object at a distance of 20 cm in front of the lens. He obtains a blurred image on the screen placed at a distance of 23 cm in front of the lens. In order to obtain the clear image, he has to move the screen
- towards the lens.
- away from the lens.
- to a position very far away from the lens.
- either towards or away from the lens.