Question # 1

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 velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

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

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Smaller

Longer

Equal

None of these

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

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6 x 10^-5rad

7 x 10^-5rad

8 x 10^-5rad

None of these

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 wave nature of light was proposed by:

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Newton

Thomas Young

Huygen

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

The least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

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 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

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

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Smaller

Larger

Zero

None of these

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

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0°

60°

90°

120°

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

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Focus

Optical center

Edges

None of these

The distance from eye to near point is taken as:

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10 cm

15 cm

20 cm

25 cm

According to Huygen's principle

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light travels in straight line

Light is a transvers wave

Light has dual nature

All points on the primary wave-front are the sources of secondary wavelets

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ECAT Physics Chapter 9 Physical Optics Online Test MCQs With Answers

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