Question # 1

The distance from eye to near point is taken as:

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10 cm

15 cm

20 cm

25 cm

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

A magnifier gives an image which is:

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Virtual, inverted

Real, erect

Virtual, erect

Real, inverted

A line which represents the direction of travel of a wave is known as:

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Spherical Wavefront

Locus

Ray

Either B or C

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

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

Electromagnetic waves transport:

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Energy only

Momentum only

Both A and B are correct

None of is correct

Huygen's theory cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

Huygen's principles states that:

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Light travels in straigth line

Light has dual nature

Either of these

None of these

For the virtual image, option _______ is not correct:

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1/p = 1/f -1/q

1/f = 1/p -1/q

1/p=1/p-1/f

1/p=1/f+1/q

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

The locus of all points in a medium having same phase of vibration is called

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Crest

Trough

Wavelength

Wave-front

Speed of light in vacuum depends upon:

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Frequency

Wavelength

Amplitude

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

In case of point, source of light shape of wavefront is:

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Spherical

Cylindrical

Plane

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

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