Question # 1

Monochromatic light means waves of:

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Same frequency

Same colour

Same wavelength

All of them

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

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

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Equal to

Greater than

Smaller than

None of these

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

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Spherical

Cylindrical

Plane

None of these

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

In the formula R = N x m for diffraction grating, N denotes:

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No. of lines/cm

No. of lines/meter

Total number of lines

None of above

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 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

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 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

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

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

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

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The upper half of the image is cut off

The brightness of the image is reduced

The brightness of the image is increased

No effect at all

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

Speed of light in vacuum depends upon:

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Frequency

Wavelength

Amplitude

None of these

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

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