The complementary colour of green is
magenta
purple
cyan
red
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
We can see the sun before the actual sunrise by about:
5 minutes
2 minutes
2 hours
20 hours
When a mirror is rotated by an angle θ,the reflected ray will rotate by :
0°
θ/2
θ
2θ
Pick out the longest wavelength from the following types of radiations.
Blue light
Gamma rays
X-rays
Red light
The three primary or basic colours are
red, blue, yellow
yellow, green, orange
red, green, yellow
red, green, blue
Rainbows are formed by
refraction and scattering
dispersion and total internal reflection
interference only
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