Question # 1

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

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

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Equal

Smaller

Greater

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 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

The ratio of the size of the image to that of object is called:

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Focal length

Aperture

Linear magnification

Principal axis

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

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Smaller

Larger

Zero

None of these

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

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

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

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Equal to

Greater than

Smaller than

None of these

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

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

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

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Greater, smaller

Smaller, smaller

Smaller, larger

Greater, larger

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 virtual image is formed when object is placed:

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Within focal length of a convex lens

Near the focal point of a concave lens

Both A and B

Away from 2F of a convex lens

Light waves are:

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Transverse wave

Longitudinal wave

Compressional wave

None of them

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

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

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

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0°

60°

90°

120°

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