Physics Light interview questions

The total internal reflection prisms are used in

1. Telescope
2. Camera
3. Simple microscope
4. Periscope

In the human eye, the focal length of the lens is controlled by

1. The pupil
2. The ciliary muscles
3. The iris
4. The retina

Which of the following are primary colours?

1. Violet, red and green
2. Blue, cyan and magenta
3. Red, green and blue
4. Red, cyan and blue

The refracted ray just graces the surface of separation. In that case the angle of refraction is

1. 45°
2. 60°
3. 90°
4. 180°

The meaning of refraction in Latin language is

1. Towards the normal
2. Moving away
3. Fracture or broken
4. Bending

The concave lens is a

1. Converging lens
2. Inverting lens
3. Magnifying lens
4. Diverging lens

When a ray of light passes from a rarer to a denser medium the reflected ray is

1. Totally reflected
2. Deviated towards the normal
3. Deviated from the normal
4. Undeviated

A convex lens does not produce a

1. Virtual magnified image
2. Virtual diminished image
3. Real diminished image
4. Real magnified image

The colour which deviates the least during dispersion is

1. Blue
2. Red
3. Green
4. Violet

The line joining the centre of curvature of the two spherical surfaces is known as

1. Principal axis
2. Optic centre
3. Focal length
4. Principal focus

When magenta, yellow and cyan are added, the colour obtained is

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

The following is used in repairing watches

1. Concave lens
2. Compound microscope
3. Astronomical telescope
4. Simple microscope

The refractive index of a medium depends upon

1. Nature of the material of the medium
2. The angle of emergence
3. The angle of refraction
4. The angle of incidence

When a ray of light passes from a denser to rarer medium, the reflected ray is

1. Returned
2. Deviated towards the normal
3. Deviated away from the normal
4. Undeviated

A fixed point lying in between the two spherical surfaces through which a ray of light passing suffers no deviation is

1. Focal length
2. Principal axis
3. Optic centre
4. Principal focus

The refractive index of glass depends on

1. The intensity of the incident light
2. The size of the glass slab
3. The colour of the incident light
4. The angle of incidence

Optical fibre is used in

1. Thermometer
2. Bioscope
3. Stethoscope
4. Endoscope

The critical angle of glass is

1. 24°
2. 42°
3. 45°
4. 90°

The final image in a compound microscope is

1. Real and erect
2. Virtual and erect
3. Virtual and inverted
4. Real and inverted

The refractive index of Benzene is

1. 1.50
2. 1.53
3. 1.54
4. 1.55

The angle of incidence for which the angle of refraction is 90° is called as

1. Critical angle
2. Obtuse angle
3. Straight angle
4. Right angle

In the human being, the part which is sensitive to light is

1. Ciliary muscles
2. Retina
3. The eye ball
4. Sclera

If an object absorbs all colours, it appears

1. Red
2. Black
3. Blue
4. Violet

For total internal reflection the angle of incidence is

1. Equal to 90 degree
2. Equal to the critical angle
3. Less than the critical angle
4. Greater than the critical angle

The distance between optic centre and principal focus of the lens is known as

1. Twice the focal length
2. Principal axis
3. Focal length
4. Optic centre

The magnifying glass is

1. Simple microscope
2. Compound microscope
3. Crown glass prism
4. Ground glass prism

The periscope is used in

1. Aeroship
2. Aerospace
3. Ship
4. Submarine

The SI unit of power of the lens is

1. Dioptre
2. Kilometer
3. Angstrom
4. Metre

The position of the object in a compound microscope is

1. At F
2. At 2F
3. Beyond 2F
4. Between F and 2F

This is used to see the lines of a person’s palm

1. Astronomical microscope
2. Compound microscope
3. Lens
4. Mirror