Question # 1

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

In water drops rainbows are formed by

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Reflection

Refraction

Dispersion

All of these

Dioptre is the term used for describing the

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Intensity of light

Density of air

Power of light

Refractive index

Which of the following is used for the failure of a lens to form a sharp and distinct image

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Distortion

Astigmation

Chromatic aberration

Spherical aberration

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

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 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

A double convex an bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

Light entering glass will not suffer change in

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Frequency

wavelength

Speed

Direction

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 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

Which statement about the image formed by a convex lens is correct.

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It is always real and eruct

It is always real and inverted

It is always virtual and erect

It may be either virtual or real

The phenomenon of total internal reflection occurs in

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Optical fibre

Rainbow

Mirage

All of these

The minimum angle of incidence for which total internal reflection can occur is called.

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Right angle

Acute angle

Critical angle

Obtuse angle

What is zoom lens

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It is a lens having fixed focal length

It is a lens having variable focal length

It is a lens used in radii to telescope

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

If the image is virtual then its distance from the lens is taken.

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Positive

Negative

Double

Half

Light rays after passing through is convex lens.

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Bend away from principal axis

Bend towards participial axis

Remain unriveted

Travel parallel to the principal axis

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

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