The red colour of the sun at the time of sunrise and sunset is because:
red colour is least scattered
blue colour is least scattered
red colour is most scattered
blue colour is most scattered
Assertion : Small glass beads fixed on traffic signals glow brightly when light falls upon them.
Reason : Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium.
Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
The refraction of light is commonly known as
bending
scattering
reflection
interference
Rainbows are formed by
reflection and diffraction
refraction and scattering
dispersion and total internal reflection
interference only
The splitting of white light into its constituent colours is called
refraction
dispersion
deviation
diffraction
Which colour is used in signal lamps?
blue
red
orange
yellow
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 transmission
diffraction and transmission
refraction,diffraction and transmission
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?
yellow - orange
We can see the sun before the actual sunrise by about:
5 minutes
2 minutes
2 hours
20 hours
