Question # 1

The locus of all points in a medium having same phase of vibration is called

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Crest

Trough

Wavelength

Wave-front

The wave nature of light was proposed by:

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Newton

Thomas Young

Huygen

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 least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

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

The image of the tip of a needle is never sharp because of

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Polarization of light

Interference of light

Diffraction of light

Reflection of light

Angle between the ray of light and the corresponding wavefront is:

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0°

60°

90°

120°

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

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Greater than

Less than

Equal to

None of these

To observe interference of light, the condition, which must be met with is that the sources must be:

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Monochromatic

Phase coherent

Both of above

None of above

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

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Spherical

Cylindrical

Plane

None of these

In order to get interference using two light rays

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The sources should be monochromatic and coherent

The sources should have the same frequency

Superposition should be linear

All of these

According to Huygen's principle

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light travels in straight line

Light is a transvers wave

Light has dual nature

All points on the primary wave-front are the sources of secondary wavelets

If the object is situated at focus of a convex lens, then its image is formed at:

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F

2F

Infinity

None of these

Monochromatic light means waves of:

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Same frequency

Same colour

Same wavelength

All of them

The distance from eye to near point is taken as:

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10 cm

15 cm

20 cm

25 cm

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