Question # 1

When we look at the sky during daytime the light that we see is sunlight that has been absorbed and then re radiated in different directions, This process is called.

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Scattering

Diffusion

Mirage

Rainbow

An object is -14 cm in front of a convex mirror The image 5.8 cm behind the mirror. What is the focal length of the mirror.

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-4.1 cm

-8.2 cm

- 9.9 cm

-20 cm

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

Which is the health care profession concerned with eyes as well as vision visual system and vision information processing in humans.

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Optometry

Ophthalmology

Telemetry

Psychology

Human's eye acts like a

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LASER

Mirror

Lens

Fibre optics

Keliner or achromat eye piece consist or

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Two plano convex lenses with same focal length

Two sets of doublets

An achromatic doublet

A spherical doublet

If a ray of light in glass in incident on an air surface at an angle greater than the critical angle, the ray will

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Refract only

Reflect only

Partially refract and partially reflect

Diffract only

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

Short sightedness in the eye occurs due to the.

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Contraction of eyeball

Increases in focal length of eye lens

Reduction in focal length of eye lens

Reduction in distance between retina and eye lens

Dioptre is the term used for describing the

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Intensity of light

Density of air

Power of light

Refractive index

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

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

Refraction contributes to the formation of.

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Rainbows only

Mirages only

Echo

Rainbows and mirages

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

The branch of medicine which deals with the anatomy physiology and diseases of the eye

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Ophthalmology

Radiology

Cardiology

Andrology

Two convex lens focal length 'f' use din combination become telescope. When the distance between them is.

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1

4f

2f

f/2

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

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

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Monocole

Axicon

Prism

Lens

The image formed on the film of a simple camera is.

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Real inverted and diminished

Virtual, upright, and diminished

Virtual, upright and magnified

Real, inverted and magnified

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

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