Question # 1

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 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

Light waves are:

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Transverse wave

Longitudinal wave

Compressional wave

None 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

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

The least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

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

Wave length of light, on the average, is given by:

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10^-14_m

10^-10_m

10^-6_m

10^-4_m

The distance from eye to near point is taken as:

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10 cm

15 cm

20 cm

25 cm

In an interference pattern of Young's double slit(YDS) experiment:

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Bright fringesare wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equal width

Central fringes are wider than the outer fringes

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

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

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Smaller

Larger

Zero

None of these

A magnifier gives an image which is:

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Virtual, inverted

Real, erect

Virtual, erect

Real, inverted

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

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

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ECAT Physics Chapter 9 Physical Optics Online Test MCQs With Answers

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