Question # 1

The refractive index of benzenes is 1.5 What is the critical angle of benzene.

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0.667 ^o

42 ^o

48^o

90^o

In a compound microscope objective lens acts as a projector and eye place as a

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Compensator

Erecting lens

Simple microscope lens

Turntable

If the image is virtual then its distance from the lens is taken.

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Positive

Negative

Double

Half

Total internal reflection occurs when the angle of incidence is.

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Greater than the angle of refraction

Equal to the critical angle

Greater than the critical angle

Greater than 45^o

When the angel of incidence becomes larger than the critical angle no refraction occurs This is known is.

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Diffraction

Refraction

Total internal reflection

Diffuse reflection

The erecting lens of a telescope produces

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A shorter instrument

wider field of view

A larger image

A sharp image

Light rays after passing through is convex lens.

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Bend away from principal axis

Bend towards participial axis

Remain unriveted

Travel parallel to the principal axis

For a prism of particular and given wavelength the resolving power varies as

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First power of lens of its base

Square of inverse length of its base

Increases of length of its base

Cube of the length of its base

A person suffering from short sighted ness uses

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Concave lens

Convex mirror

Convex lens

Concave mirror

In a compound microscope magnification will be large if focal length of eyepiece is

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Large

small

Equal to that of the objective

Larger than that of the objective

The aberration in the image formed by a lens due to different wavelengths present in a source is called.

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Spherical aberration

Chromatic aberration

Astigmation

Achromatic aberration

Image formed by a camera is

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Real, inverted, and diminished

Virtual, upright and diminished

Virtual, upright and magnified

Real, inverted and magnified

A rod of refractive index 1.42 is immersed in a liquid of refractive index 1.42 the rod will

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Become invisible

appear slightly bent

Appear slightly raised

Reduce its refractive index

Which of the following electron wavelength is used in electron microscope.

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Short

Extremely short

Large

Moderate

The power of a convex lens is 5 D at what distance the object should be placed from the lens so that its real and 2 times larger image is formed.

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25 cm

30 cm

35 cm

40 cm

A real object paled inside the focus of a convex lens gives

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Real image but diminshed

Real image but enlarged

virtual image but diminished

Virtual image but enlarged

Dispersive power of a prism depends upon the wavelength of the light used and is

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More for large wavelengths

Less for large wavelengths

More for small wavelengths

Less for small wavelengths

The ability's of convex lens to produce convergence in a parallel beam is called its.

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Magnification

Focal length

Power

Strength

Which instrument measures the magnification of a telescope.

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lactometer

dynamometer

Wattmeter

Ammeter

Which of the following are defects in human eye.

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Myopia

Hypermetropia

Presbyopia

All of these

Power of the lens is one dioptre, if its focal length is.

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1/6 metre

1/2 metre

1 metre

8 metre

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