Question # 1

When the angel of incidence becomes larger than the critical angle no refraction occurs This is known is.

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Diffraction

Refraction

Total internal reflection

Diffuse reflection

use of outer layer in optical fires called cladding is mainly to.

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Scatter thelight

Absorb unwanted light

Transmit the light

Produce total internal reflection

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

Why does a glass plate inside a colorless liquid become invisible

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The colours of both are same

The densities of both are same

Their refractive indices are same

Their refractive indices are different

The magnifying power of a convex lens of focal length 5 cm is

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3

5

6

20

The length of an astronimical telescope for normal vision is.

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fo x fe

fe/fe

fo - fe

fo + fe

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 was the transparent front part of the eye that covers the pupil, iris and interior chamber.

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Cornea

Fovea

Sclera

Choroid

A part of electromagnetic spectrum that can be detected by the human aye

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Angle of incidence

Angle of refraction

Light

Angle of reflection

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

The refractive index of benzenes is 1.5 What is the critical angle of benzene.

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0.667 ^o

42 ^o

48^o

90^o

A direct vision spectroscope is better than a prism spectrometer because it helps in

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Observing the spectrum without a source

Observing the spectrum perpendicular to a source

Observing the spectrum in line with the source

all of the above

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 power of convex lens of focal length 50 cm will be

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1,0 dioptre

2.0 dioptre

4.0 dioptre

5.0 dioptre

In optics, which subfield studies the measurement of electromagnetic radiation including visible light.

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Radiometry

Photometry

Telemetry

Chronometry

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

Which parameter determines the brightness of a light source sensed by an eye.

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Light energy entering the eye

Wavelength of light

Total radiant flux entering the eye

Total luminous flux entering the eye

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

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 a ray of light is incident perpendicularly to the boundary of two media.

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It pass through without bending

It is speed is faster int he optically denser medium

It derivates from its original path

It is totally reflected back

Two convex lenses of equal focal length 'f' are placed in contact, the resultant focal length is

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Zero

1

2f

f/2

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