Question # 1

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

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1

0.2

2

0.1

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 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

Least distance of distinct vision of an old man possibly becomes:

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A little less than 25 cm

A little more than 25 cm

Much less than 25 cm

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 terms phase difference and path difference are:

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Same

Different

Equal

None of these

With age, least distance of distinct vision:

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Increases

Decreases

Is not affected

None is correct

Monochromatic light means waves of:

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Same frequency

Same colour

Same wavelength

All of them

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

The least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

Fringe width will remain unchanged

Fringe will become less intense

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

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Smaller

Larger

Zero

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

The locus of all the points in the same phase of vibration is called:

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Wave packet

Wave front

Wave number

None of them

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

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

Wave length of that color as compared to that of violet color is:

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Smaller

Longer

Equal

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

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