Question # 1

Speed of light in vacuum depends upon:

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Frequency

Wavelength

Amplitude

None of these

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:

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5 cm

10 cm

20 cm

25 cm

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

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Bright

Dark

Any of A and B

None of these

The focal length of convex lens having magnifying power of 5.55 is:

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5.5 cm

5 cm

4.5 cm

6 cm

A line which represents the direction of travel of a wave is known as:

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Spherical Wavefront

Locus

Ray

Either B or C

The wave nature of light was proposed by:

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Newton

Thomas Young

Huygen

None of these

The appearance of the colour in the soap (oil) film results from:

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Dispersion

Interference

Reflection

Refraction

Which one of the following can act approximately as a source of monochromatic light;

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

The cause of mirage observed in deserts in bright sunlight is due to

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Refraction of light

Reflection of light

Scattering of light

Total internal reflection of light

Frequency of red color as compared to that of violet color is:

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Equal

Smaller

Greater

None of these

A grating with high resolving power can distinguish _______ difference in wavelengths :

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Smaller

Larger

Zero

None of these

In case of point, source of light shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

The velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

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