When a mirror is rotated by an angle θ,the reflected ray will rotate by :
0°
θ/2
θ
2θ
When a CD (compact disc used in audio and video systems) is seen in sunlight,rainbow like colours are seen.This can be explained on the basis of the phenomenon of :
reflection and diffraction
reflection and transmission
diffraction and transmission
refraction,diffraction and transmission
The twinkling of stars is due to atmospheric :
reflection of light
dispersion of light
interference of light
refraction of light
Who discovered by his experiments with glass prisms that white light consists of seven colours?
Newton
Brewster
Maxwell
Thomas young
The stars appear higher in the sky than they actually are,due to :
diffraction of light
scattering of light
We can see the sun before the actual sunrise by about:
5 minutes
2 minutes
2 hours
20 hours
Pick out the longest wavelength from the following types of radiations.
Blue light
Gamma rays
X-rays
Red light
The splitting of white light into its constituent colours is called
refraction
dispersion
deviation
diffraction
Suppose a rocketship is receding from the earth at a speed of 2/10 th the velocity of light.A light in the rocketship appears blue to the passengers on the ship.What colour would it appear to an observer on the earth?
blue
orange
yellow
yellow - orange
Which colour is used in signal lamps?
red
