Question # 1

An oil film on water surface shows colour due to.

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Diffraction

Interference

Polarization

Dispersion

The centre of Newton's rings will be

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Dark

Bright

Coloured

Not visible

Which one of the following can not be polarized.

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Ultra violet rays

Radio waves

T.V. Waves

Sound waves

Example of thin film is.

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Soap burble

convex lens

Concave lens

Glass plate

The property of bending of light around obstacles is

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Interference

Diffraction

Polarization

Superposition

Bending of light around the edges of an obstacle is called.

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Refraction

Polarization

Interference

Diffraction

The distance between two consecutive wave front is equal to

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One wave length

Two wave length

Half wave length

Three wave length

The process of confining the beam of light to vibrate in one plane is called.

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Interference

Diffraction

Polarization

Total internal refraction

When one mirror of a Michelson interferometer is moved a distance of 0.5 mm, 2000 fringes and observed, The wavelength of light used is.

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5000 m

50000 A^o

500 cm

2000 A^o

In blue light is used as compare to red light then fringe spacing.

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Increase

Decreases

Remain same

Becomes zero

Sodium chloride in a flame gives

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Green light

White light

Red light

Yellow light

A typical diffraction grating has certain number of lines per centimeter whose range is.

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40 to 50

400 to 5000

400 to 500

4000 to 5000

Standard metal according to Michelson's interferometer is equivalent to

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1553163.5 wave meter

3 x 108meter

15503000 meter

None of these

Young in 1801 performed experiment for the first time about

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Interference

Diffraction

Polarization

Particle nature of light

The fringe spacing increases if we use.

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Yellow light

Green lgiht

Blue light

Red light

Oil film floating on water exhibits colours due to

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Interference

Diffraction

Polarization

All of these

Angle between ray of light and wave front is

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0 ^o

60 ^o

90 ^o

120 ^o

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