Question # 1

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

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Decreases

Remain same

Increases

Becomes zero

Huygen's proposed, light energy travels in space from source in

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1578

1678

1778

1868

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

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 distinguish between transverse and longitudinal wave_______ is used.

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Refraction

Interference

Diffraction

polarization

Oil film floating on water exhibits colours due to

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Interference

Diffraction

Polarization

All of these

Michelson's interferometer can be used ot find the

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Velocity of light

Wavelength of light

Velocity of sound

Wavelength of sound

Newton's rings are formed due to phenomenon of.

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Interference

Dispersion

Diffraction

Polarization

Light entering rom air glass does not change in its.

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Frequency

Wavelength

Velocity

Direction

Sodium chloride in a flame gives

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Green light

White light

Red light

Yellow light

According to Hygen's principle, each point on a wave front acts as a source of.

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Secondary wavelet

New wave front

Sound

Primary wavelet

The fringe spacing in a double slit experiment can be increased by decreasing.

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Wavelength of light

Width of slits

Slit separation

Distance between the slits and the screen

Bright fringes are also called as

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Minima

Maxima

Wave front

Ray of light

Fringe spacing in Young's double slit experiment increases due to increase in.

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Slit separation

Wave length

Order of Fringe

Frequency of source

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 fringe spacing increases if we use.

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Yellow light

Green lgiht

Blue light

Red light

Fringe spacing is inversely proportional to.

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Wave length

Slit separation

Distance between the slit and screen

Frequency of light

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Physics Fsc Part 1 Chapter 9 Online Test MCQs With Answers

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