Question # 1

Dark fringes are also called as

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Minima

Maxima

Wave front

Ray of light

Light waves emitted from a source spread in

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Specific direction

All direction

Upward direction

None of these

Angle between ray of light and wave front is

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0 ^o

60 ^o

90 ^o

120 ^o

In young's double slit experiment for the interference the central region will be

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Dark

Bright

Coloured

None of these

the locus of all pint in the same wave of vibration is called.

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Wave front

Diffraction

Interference

Polarization

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

The blue colour of sky is due to

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diffraction

Reflection

Polarization

Scattering

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

Which is nooptically active

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Sugar

Tartaric acid

Water

Sodium chloride

A ray of light shows the direction of propagation of light It is line which is.

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Normal to the wave front

Parallax to the wave front

Opposite to the wave front

Equal to the wave front

Soap film is sunlight appears coloured due to.

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Dispersion of light

Diffraction of light

Scattering of light

Interference fo light

If 'N' is number of lines rule don the grating having length 'L' then grating element 'd' is given by.

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N/L

2N/L

L/N

N/2L

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

Hygen's principle is used for.

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Explain polarization

Locate the wave front

Find the speed of light

Find the index of refraction

The Bragg's equation is given by

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Light entering rom air glass does not change in its.

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Frequency

Wavelength

Velocity

Direction

When newton ring are seen through the transmitted light, then central spot is.

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Dark

Blue

Bright

Red

The distinguish between transverse and longitudinal wave_______ is used.

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Refraction

Interference

Diffraction

polarization

A ray of light is a line

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Parallel to wave front

Normal to wave front

Anti-parallel to wave

Any one of these

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

The centre of Newton's fringe is dark due to.

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Destructive interference

Diffraction

Constructive interference

Polarization

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