Question # 1

Which type of image is formed by a concave lens on a screen.

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Inverted and real

Inverted and virtual

Upright and real

Upright and virtual

The phenomenon of regular refraction of light illustrates taht.

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Light is reflected in one direction only

Light is reflected through a range of different angles

Light is refracted in one direction only

Light is refracted through a range of different angles.

The dioptre power of concave lens of 10 cm focal length is.

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0.1 dioptre

1.0 diopter

10 dioptre

-10 dioptre

The ablate of rays of different colours to converge a single point sifter refraction though a convex lens is called.

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Come

Distortion

Spherical aberration

Chromatic aberration

the depth of a pond is 4 m What is the apparent depth of the pond if the water level is 3.5 m high. The refractive index of water is 1.33

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1.9 m

2.3 m

3.13 m

4.5 m

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

Reciprocal of the focal length is called.

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Radios of curvature of the lens

Power of the lens

Aperture of the lens

Resolving power

The bending of light when it enters a medium

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Reflection

Refraction

Diffraction

Total internal reflection

Which instrument measures the magnification of a telescope.

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lactometer

dynamometer

Wattmeter

Ammeter

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 variation of focal length of a lens when we pass from the central portion to periphery is called.

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Coma

Astigmatism

Spherical aberration

Chromatic aberration

The primary purpose of using a large aperture objective in a telescope is to produce

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Brighter image

Larger image

Wider field of view

Smaller image

Lenses are commonly made of.

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Glass only

Plastic only

Glass and clear plastic

Aluminium

Which of the following colours of light passes through glass with minimum speed.

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Green

Yellow

Red

Violet

Clouds are white because they efficiently scatter sunlight of all

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Colours

Wavelengths

Frequencies

Phases

The maximum number of rays required by a lens to form an image are

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2

3

4

Infinite

The power of lens in dioptres is

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Its focal length in meters

The reciprocal of its focal length in metres

The reciprocal of length in metres

The reciprocal of length in centimetres

A bi convex lens of a material of refractive index 1.5 has the radius of curvature of each side equal to 50 cm the power of the lens will be.

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0.5 dipotre

1.0 dioptre

1.5 diopter

2.0dioptre

Which Muslim Scientist is regarded as 'Father of Optics"

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Nasir al Din al Tusi

Ibn Ishaq al kundi

Ibn Musa Al khawarzmi

Ibn al Haithem

A ray of light from air into glass The angle of incidence is 30o if the refractive index of glass in 1.52 The angle of refraction will be.

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16.7 ^o

19.3 ^o

29.6 ^o

39.3 ^o

A lens whose thickness is small as compared to focal length is a

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Concave lens

Double concave lens

Convex lens

Plano concave lens

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