Question # 1

The angle of incidence that causes the refracted ray in the rarer medium to bend though 90^o is called.

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Critical angle

solid angle

Plane angle

Acute angle

The maximum distance between an object and its real image in case of convex lens is

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f

2f

2.5 f

4 f

Refractive index of a medium is define das.

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speed of light in vaccum/speed of light in medium

Speed of light in medium/Speed of light in vacuum

Speed o flight in air/speed of light in medium

Speed of light in medium/Speed of light in air

The ability of eye to focus near as well as distant object is termed as.

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Myopia

Persistence of vision

Power of accommodation

Astigmatism

The line passing symmetrically though the optical center of the lens is.

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Focal plane

Principal focus

Principal axis

Focal length

The normal adjustment the magnifying power of an astronomical telescope is.

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fe/fo

fo/fe

fo+ fe

fo -fe

Which statement about the image formed by a convex lens is correct.

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It is always real and eruct

It is always real and inverted

It is always virtual and erect

It may be either virtual or real

What is zoom lens

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It is a lens having fixed focal length

It is a lens having variable focal length

It is a lens used in radii to telescope

All of the above

The value of critical angle of glass is

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45^o

42^o

48^o

52^o

On which property of lens, longitudinal chromatic aberration depend upon

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Resolving power

Dispersive power

Magnifying power

Radius of curvature

Spherical aberration can be removed by using

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Concave lens

Convex lens

By limiting the number of rays using a stopper

By using a concave convex lens

A person suffering from short sighted ness uses

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Concave lens

Convex mirror

Convex lens

Concave mirror

Which of the following is used for reducing spherical aberrations in optical instruments.

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Plano convex lens

Concave lens

Spherical mirrors

Piane mirrors

The magnifying power of a convex lens of focal length 5 cm is

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3

5

6

20

An image formed on the film of camera is

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Real , inverted and diminshed

Virtual, inverted and diminshed

Real upright and diminished

Virtual, upright and idminshed

When a ray of light is incident perpendicularly to the boundary of two media.

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It pass through without bending

It is speed is faster int he optically denser medium

It derivates from its original path

It is totally reflected back

In a magnifying glass, the objective is placed at a distance

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Less than the focal

Between the focal length and twice the focal length

Greater than twice the focal length

At the focus of the lens

What would be the colour of sky through hour the day .If the earth has no atmosphere.

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Blue

Red

White

Black

A converging mirror with a radius of 20 cm creates a real image 30 cm from the mirror What is the object distance.

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-5.0 cm

-7.5 cm

-15 cm

-20 cm

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

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

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Short

Extremely short

Large

Moderate

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