Question # 1

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

Huygen's principles states that:

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Light travels in straigth line

Light has dual nature

Either of these

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

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

The least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

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

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

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

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

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

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

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Smaller

Larger

Zero

None of these

Speed of light in vacuum depends upon:

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Frequency

Wavelength

Amplitude

None of these

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

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Smaller

Larger

Zero

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

The focal length of convex lens having magnifying power of 5.55 is:

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5.5 cm

5 cm

4.5 cm

6 cm

A magnifier gives an image which is:

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Virtual, inverted

Real, erect

Virtual, erect

Real, inverted

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 image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

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1

0.2

2

0.1

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