Question # 1

In an interference pattern of Young's double slit(YDS) experiment:

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Bright fringesare wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equal width

Central fringes are wider than the outer fringes

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, infrared rays, micro waves

Visible light, gamma rays, radio waves

A virtual image is formed when object is placed:

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Within focal length of a convex lens

Near the focal point of a concave lens

Both A and B

Away from 2F of a convex lens

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

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

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Double the size

Same size

Half the size

None of these

Light appears to travel in straight line because

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It is not absorbed by the atmosphere

It is refracted by the atmosphere

Its wavelength is very small

Its velocity is very large

A prism splits a beam of white light into seven component colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Wavelength of different colors is different

Velocity of different colors is different

Huygen principle is used to determine:

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Speed of light

Location of wavefront

About polarized or unpolarized light

None of them

Conventionally, all the distance p, q, f are measured from _____ of the lens:

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Focus

Optical center

Edges

None of these

Huygen's theory cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

The property of light which does not change with the nature of the medium is:

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Frequency

Amplitude

Wavelength

None of these

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

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Greater, smaller

Smaller, smaller

Smaller, larger

Greater, larger

The wave nature of light was proposed by:

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Newton

Thomas Young

Huygen

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

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

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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