Question # 1

The erecting lens of a telescope produces

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A shorter instrument

wider field of view

A larger image

A sharp image

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

Which of the following are defects in human eye.

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Myopia

Hypermetropia

Presbyopia

All of these

Lenses are commonly made of.

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Glass only

Plastic only

Glass and clear plastic

Aluminium

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

To reduce spherical aberration in optical instruments which of the following should be used.

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Plano convex lenses

Concave lenses

Spherical mirrors

Plane mirrors

What is the focal length of a normal eye lens.

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1 mm

2 cm

25 cm

1 m

Which of the following is used for the failure of a lens to form a sharp and distinct image.

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Distortion

Astrigmation

Chromatic aberration

spherical aberration

What is the magnifying power of a convex lens of focal length 5 cm.

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3

5

6

20

The image formed by a projector is

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Real, inverted and enlarged

Real, upright and enlarged

Real ,inverted and diminished

Virtual, upright and diminished

The index of refraction for a substance is

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Constant

Constant for a given wavelwngth

Variable with the speed of light

Never constant

Which Muslim Scientist gave the first clear description and correct analysis of pinhole camera.

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Nasir al Din Al tusi

Ibn al Haithem

Ibn Ishaqal kundi

al -Khawarizmi

Linear magnification is equal to the ratio of.

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Size of the object to the size of the image

Size of the image to the size of the object

size of the object focal length

Size of the image focal length

A double convex an bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

A person of height 1.5 m stands 2.0 m in front of a plane mirror How far from the person is her image .

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2.0 m

3.0 m

3.5 m

4.0 m

In compound microscope image formed by the eyepiece is

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Real

Inverted

erect

diminished

A diverging lens may not have

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Negative focal length

Positive focal length

One plane surface

One convex surface

Light rays after passing through is concave lens.

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Bend away from principal axis

Bend towards principal axis

Remain undeviated

Travel parallel to the principal axis

The image of an object 5 mm high is only 1 cm high. The magnification of the lens is

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0.2

0.5

1

2

Which of the following is the cause of failure of a lens to form a sharp and district image of a white object.

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Spherical aberration

Chromatic aberration

Distortion

Astigmatism

A double convex air bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

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