Question # 1

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 distance from eye to near point is taken as:

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10 cm

15 cm

20 cm

25 cm

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

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0°

60°

90°

120°

The least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

Light waves are:

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Transverse wave

Longitudinal wave

Compressional wave

None of them

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

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Diffraction

Interference

Polarization

Dispersion

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

A prism splits a beam of white light into seven component colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Wavelength of different colors is different

Velocity of different colors is different

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

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Dispersion

Interference

Reflection

Refraction

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

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

The size of the image is maximum when its distance from the magnifying glass is:

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0.10 m

0.15 m

0.20 m

0.25 m

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

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

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Smaller

Larger

Zero

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 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

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ECAT Pre General Science Physics Chapter 9 Physical Optics Online Test MCQs With Answers

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