Question # 1

To see the minor details of the object by microscope, it should have:

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High magnifying power

High resolving power

Am objective of larger focal length

None of these

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 of the following phenomenon cannot be explained on the bases of Huygen's theory

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Refraction

Reflection

Diffraction

Formation of spectrum

If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:

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5 cm

10 cm

15 cm

20 cm

Laws of reflection and refraction can also be explained by:

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Particle nature of light

Quantum nature of light

Wave nature of light

Complex nature of light

When a source of light isat very large distance,the shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

The ratio of the size of the image to that of object is called:

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Focal length

Aperture

Linear magnification

Principal axis

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

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Smaller

Larger

Zero

None of these

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 wave nature of light was proposed by:

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Newton

Thomas Young

Huygen

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

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

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0°

60°

90°

120°

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 least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

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Greater than

Equal to

Smaller than

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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