Question # 1

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

Which of the following is a transport optical element with flat polished surfaces that refract light.

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Monocole

Axicon

Prism

Lens

In case of a convex lens when object is placed at 2F image is formed.

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At

2F

away from 2F

Between F at and 2 F

Plossi or symmetrical eye piece consists of

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Two plano convex lenses with same focal length

Two sets of doublets

An achromatic double

A spherical doublet

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

Which is the branch of medicine that deals with the anatomy physiology and diseases of the eye.

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Ophthalmology

Psychology

Andrology

Gynecology

Fiber optics system can be used for.

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Word processing

Image processing and receiving

Image transmitting

All of the above

Which of the following does not produced an erect image.

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Galilean telescope

Terrestrial telescope

Prism binoculars

Astronomical telescope

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

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 characteristic of an image formed by a plane mirror is.

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It is of the same size as the object

It is laterally inverted

It is upright

All of the above

When an obliquely falling ray of light enters from one medium ot another it changes its path this phenomenon is called.

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Reflection

Refraction

Diffusion

Diffraction

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

The relation between refractive index an critical angle is.

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sin C =1/n

sin n = 1/C

sin c = 1

n = sin C

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

What is the refractive power of cornea in humans.

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13 dioptres

23 diaoptres

33 dioptres

43 dioptres

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

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Distortion

Astigmation

Chromatic aberration

Spherical aberration

What is the cause of mirage in desert areas.

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Refractive index of atmosphere increases with height

Refractive index of atmosphere decreases with height

Refractive index of atmosphere remains constant

Scattering

A diverging lens may not have

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Negative focal length

Positive focal length

One plane surface

One convex surface

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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