Question # 1

Telecommunication by Optical fibers is done by

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Single mode step index fibre

Multimode step index fibre

Multimode graded index fibre

All of the above

For total internal reflection the light rays enter

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From rarer to denser medium

From, denser to rarer medium

Medium of same refractive index

At an angle 90 ^o

Image formed by a concave lens is.

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Real

Magnified

Virtual

Real and magnified

Which type of image is produced by the converging lens of human eye if it views a distant object.

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Real, erect, same size

Real, inverted, diminished

Virtual, erect, diminshed

Virtual, inverted, magnified

Which type of microscope was the first to be developed.

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Optical microscope

Digital microscope

Electron microscope

All were developed at the same time

A convex mirror is used to reflect light from an object placed 66 cm in front of the mirror. The focal length of the mirror is 46 cm Find the location of the image.

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23 cm

-23 cm

-27 cm

27 cm

Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty faith of a second on the.

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Retina

Heart

Mind

Liver

Dioptre is the term used for describing the

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Intensity of light

Density of air

Power of light

Refractive index

Chromatic aberration can be removed by using.

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Convex lens

Two convex lenses

Concave lens

Combination of a convex lens and a concave lens

The blooming of the image due to dispersion in lenses is called.

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spherical aberration

Chromatic aberration

Astigmation

Curvature of image field

In case of a convex lens when object is placed away from 2F, image is formed.

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at F

at 2F

away from 2 F

Between F and 2 F

A convex lens of focal length 6 cm to be used to from a virtual image three times the size of the object Where must the lens be placed.

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1 cm

2 cm

3 cm

4 cm

The focal length of a thin converging lens is 10 cm What is the maximum distance from the lens that the object can be placed so that the lens acts as a magnifying glass.

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5 cm

10 cm

15 cm

20 cm

Michelson used the equation to determine the speed of light.

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c = 4 fd

c = 8fd

c =12 fd

c = 18 fd

Which of the following phenomenon is caused by the different speeds of light in differed optical media.

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Reflection

Refraction

Diffraction

Total internal reflection

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 of the following factors determines the resolving power of an instrument.

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magnification

Total length of objective

Diameter of objective

Refractive index of objective

Why danger signals are made red.

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Our eyes are more sensitive to real colour

Red colour has minimum scattering

Red colour has maximum scattering

Red colour has maximum frequency

What is the refractive power of cornea in humans.

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13 dioptres

23 diaoptres

33 dioptres

43 dioptres

The image of distant object as seen through as astronomical telescope is.

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Real and inverted

Virtual and inverted

Real and erect

Virtual and erect

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

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