Question # 1

Which part of hole located in the centre of the eye that allows light to enter the retina.

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Iris

Pupil

Cornea

Fovea

linear magnification is the ratio between the

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Distances of object and image from mirror

Distances of object and image from the focal point

Distance of image and object from the mirror

Distance of image from object and the distance of object from mirror

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 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 get large magnifying power of an astronomical telescope. we should have focal length of eye lens.

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Small

Large

Of any value

Infinity

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

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

Loss of power is optical fibre result into

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Poor receipt ion of signals

Delay in time for reception of signals

accurate information at the receivers

All of the above

The main advantage of step index fiber is.

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The size of the cable

The equality of the cbale

Difference in the wavelengths of signals

All of the above

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

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

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

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Ophthalmology

Radiology

Cardiology

Andrology

The power of convex lens is 10 d. At what distance the 3 times larger image is formed.

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9.6 cm

2.3 cm

13.3 cm

17.6 cm

Which of the following are defects is lenses.

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Chromatic aberration

Spherical aberration

Astigmation

All of the above

Eye colour is the colour of

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Iris

Retina

Comea

Pupil

The critical angle will be maximum when light travels from

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Glass of air

Water to air

Water to glass

Glass to water

A simple astronomical telescope consists of two

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Concave lenses

Convex mirrors

Convex lenses

Plano convex lenses

Parallel rays of light are focused by a thin convex lens.A thin concave lens of the name focal length is then joinjed to the convex lens The focal point will.

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Shift to infinity

shift towards the lens by a small distance

shift away from he lens by a small distance

Remain at its original position

The near point of a person is 50 cm and his far point is 200 cm The power of the lenses which his spectacles should have to see clearly distant objects will be.

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-0.5 D

-10 d

-1.5 D

-2.0 D

The maximum distance between an object and its real image in case of convex lens is

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f

2f

2.5 f

4 f

A young man wearing glasses does not require bifocals because he

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Is farsighted

Has the ability to accommodate

Is short signed

Does not suffer from coma

Which of the following be used for redeciding mechanical aberration is optical instruments.

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Plane mirrors

Spherical mirrors

Concave lenses

Plano convex lenses

An object of placed at the centre of curvature of a concave mirror The image produced by the mirror is located.

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Out beyond the centre of curvature

At the centre of curvature

Between the centre of curvature and the focal point

At the focal point

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