When we stand in sunlight we feel the heat due to the presence of
Infrared radiation
Ultraviolet radiation
Radio waves
Electromagnetic radiation
Law of photoelectric effect was discovered by
Sir Isaac Newton
Christian Huygens
Willebrord Snell
Albert Einstein
The separation of a beam of white light into its constituent colours is known as
Refraction of light
Reflection of light
Dispersion of light
None of these
The point at which the incident ray meets the separating surface is called
Point of incidence
Point of refraction
Point of diversion
When the light travels along the normal
It bends towards the normal
It bends away from the normal
There is no deviation
The refractive index of a medium is expressed as the ratio of
The speed of light in air to the speed of light in the medium
The speed of light in medium to the speed of light in air
The speed of light in the medium to the speed of light in water
The speed of light in water to the speed of light in the medium
The band of colours that we get when white light splits into its components is known as the
Refractive index
Spectrum
Prism
Where will the image be formed when the object is at infinity ?
At F
At F on other side of the lens
At 2F
At 2F on other side of the lens
When the object is beyond 2F, the image formed is
at F
at 2F
Between F and 2F
at infinity
