Question # 1

The magnifier forms a virtual image of the object at:

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Least distance of distinct vision

Much farther than the least distance

Both A and B are correct

None of these

Huygen's principles states that:

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Light travels in straigth line

Light has dual nature

Either of these

None of these

The appearance of the colour in the soap (oil) film results from:

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Dispersion

Interference

Reflection

Refraction

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

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

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

The contrast in the fringes in an interference pattern depends upon

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Fringe width

Relative difference intensities of the two sources

Distance between the slits

Wavelength

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

Light waves are:

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Transverse wave

Longitudinal wave

Compressional wave

None of them

With age, least distance of distinct vision:

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Increases

Decreases

Is not affected

None is correct

The magnifier forms a virtual image of the object at:

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Least distance of distinct vision

Much farther than the least distance

Both A and B are correct

None of these

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

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

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

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Focus

Optical center

Edges

None of these

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

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Equal

Smaller

Greater

None of these

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ECAT Physics Chapter 9 Physical Optics Online Test MCQs With Answers

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