Question # 1

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 least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:

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5 cm

10 cm

15 cm

20 cm

The appearance of the colour in the soap (oil) film results from:

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Dispersion

Interference

Reflection

Refraction

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

Light waves are:

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Transverse wave

Longitudinal wave

Compressional wave

None of them

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

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

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

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Greater than

Equal to

Smaller than

None of these

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

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

In order to get interference using two light rays

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The sources should be monochromatic and coherent

The sources should have the same frequency

Superposition should be linear

All of these

The velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

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

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

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