Question # 1

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

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

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

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

Stars twinkle due to

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The fact that they do not emit light continuously

The refractive index of earth's atmosphere fluctuates

The Star's atmosphere absorbs its light intermittently

None of these

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

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

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Frequency

Amplitude

Wavelength

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

A ray passing through optical center of a lens, after refraction:

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Passes through focus

Go deviated

Retraces its path

Both B and C

The least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

Frequency of red color as compared to that of violet color is:

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Equal

Smaller

Greater

None of these

Which one of the following can act approximately as a source of monochromatic light;

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Neon lamp

Fluorescent tube

Sodium lamp

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

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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