Question # 1

To obtain is parallel beam from the headlight of a car it must be fitted with.

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A convex mirror

A concave mirror

A convex lens

A concave lens

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

Which of the following does not produced an erect image.

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Galilean telescope

Terrestrial telescope

Prism binoculars

Astronomical telescope

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

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

Two lenses of focal length 'f' are combined the resultant focal length is

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f

2f

f/2

zero

The phenomenon of total internal reflection occurs in

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Optical fibre

Rainbow

Mirage

All of these

The point midway between the lens surface on its participial axis

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Optical centre

Principal focus

Focal plane

Focal length

A fixed point inside the lens through which a ray of light does not change its path is called.

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Pole

Focus

Centre of curvature

Opticla centre

The object of a telescope is very large this is to have an image which is.

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More magnified

Of better resolution

More bright

More clear

The phenomenon of regular refraction of light illustrates taht.

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Light is reflected in one direction only

Light is reflected through a range of different angles

Light is refracted in one direction only

Light is refracted through a range of different angles.

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 the lens acts as a magnifying glass.

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5 cm

10 cm

15 cm

20 cm

Light rays after passing through is concave lens.

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Bend away from principal axis

Bend towards principal axis

Remain undeviated

Travel parallel to the principal axis

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

The length of an astronimical telescope for normal vision is.

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fo x fe

fe/fe

fo - fe

fo + fe

Human's eye acts like a

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LASER

Mirror

Lens

Fibre optics

The critical angle for a beam of light passing from water into air is 48.8 o This mean that all light rays with an angle of incidence greater than this angle will be.

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Absorbed

Totally reflected

Partially reflected and partially transmitted

Totally transmitted

A double convex lens acts as diverging lens when the object is.

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Inside the focus

At the focus

Between F and 4 F

a 4F

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

What is the magnifying power of a convex lens of focal length 5 cm.

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3

5

6

20

Which of the following is used for reducing spherical aberrations in optical instruments.

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Plano convex lens

Concave lens

Spherical mirrors

Piane mirrors

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