Question # 1

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 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

In case of a convex lens when object is placed away from 2F, image is formed.

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at F

at 2F

away from 2 F

Between F and 2 F

A convex mirror is used to reflect light from an object placed 66 cm in front of the mirror. The focal length of the mirror is 46 cm Find the location of the image.

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23 cm

-23 cm

-27 cm

27 cm

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

What is the type of corrective lens used to correct or enhance the vision is only one eye.

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Axicon

Monocle

Zoom lens

Camera lens

The bending of light when it enters a medium

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Reflection

Refraction

Diffraction

Total internal reflection

When a ray of light travelling in a denser medium enters into a rarer medium.

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It remains undeviated

It is reflected back

It bends towards the normal

It bends away from the normal

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

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

The working principal of a photograph enlarger is basically the same as that of a.

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Camera

Side projection

Microsopce

Telecopse

The final image produced by a microscope is.

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Real and erect

Virtual and erect

Real and inverted

Virtual and inverted

When we decrease the diameter of the objective lens of a telescope the resolution of telescope

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Increases

Decreases

Remain the same

Depends upon the focal length of the lens

What would be the colour of sky through hour the day .If the earth has no atmosphere.

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Blue

Red

White

Black

The deflection image due to oblique centric rays failing on the lens is called.

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Coma

Spherical aberration

Astigmatism

Curvature of image field

In water drops rainbows are formed by

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Reflection

Refraction

Dispersion

All of these

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

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 that the lens acts as a magnifying glass.

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5 cm

10 cm

15 cm

20 cm

A terrestrial telescope produces

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An react and real image

An inverted and real image

An inverted and virtual image

An erect and virtual image

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

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

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