Light interview questions

Total internal reflection of light is possible when light enters from

1. Water to air
2. Air to water
3. Vacuum to air
4. Air to glass

Camberts, law is related to

1. Illumination
2. Interference
3. Reflection
4. Refraction

An air bubble in water will act like a

1. Concave lens
2. Concave mirror
3. Convex lens
4. Convex mirror

Panchromatic photographic film is sensitive to

1. Light of red colour
2. Light of yellow colour
3. Light of violet colour
4. The entire region of the visible spectrum

The nature of image formed by a plane mirror is

1. Of the same size as the object
2. Virtual and erect
3. Laterally inverted
4. All of the above are correct

An object is placed between two parallel mirrors. The number of images formed is

1. 4
2. 6
3. 8
4. Infinite

The refractive index of a given piece of transparent quartz is greatest for

1. Red light
2. Yellow light
3. Violet light
4. Green light

Optical fibres are based on

1. Total internal reflection
2. Refraction
3. Scattering
4. All of these

The head mirror used by E.N.T. doctors is

1. Plano convex
2. Plane
3. Concave
4. Convex

Which mirror is to be used to obtain a parallel beam of light from a small lamp?

1. Concave mirror
2. Plane mirror
3. Convex mirror
4. Any one of these

Angular separation between two colours of the spectrum depends upon

1. Angle of incidence
2. Angle of deviation
3. Size of the prism
4. All of these

Total internal reflection can take place when light travels from

1. Air to glass
2. Air to water
3. Water to glass
4. Diamond to glass

For an astronaut in a space ship, the sky appears

1. Blue
2. Green
3. White
4. Black

The chemical part of the dye that absorbs light and produces colour is called

1. A pigment
2. A photo chrome
3. Neon
4. A chromophore

A laser beam is always

1. A parallel beam
2. A divergent beam
3. A convergent beam
4. None of these

A red flower kept in green light will appear

1. Black
2. Red
3. Black
4. Green

Diffusion of light in the atmosphere takes place due to

1. Water vapours
2. Helium
3. Dust particles
4. Carbon dioxide

Young’s experiment established that

1. Light is both particle and wave
2. Light is neither particle nor wave
3. Light consists of particle
4. Light consists of waves

Line spectrum contains information about

1. The atoms of the source
2. The molecules of the source
3. The atoms of the prism
4. None of the above

The phenomenon of splitting white light into seven colours is called

1. Refractive index
2. Dispersion
3. Refraction
4. Reflection