Question # 1

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 magnifying power of a convex lens of focal length 5 cm.

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3

5

6

20

Since light rays are always diverged by concave lenses such lenses

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Cannot form images

Form only black and white images

From only invented image

Form only erect images

The index of refraction for a substance is

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Constant

Constant for a given wavelwngth

Variable with the speed of light

Never constant

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 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

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

The real depth of a swimming pool is 2 m What is the apparent depth of the pool if the refractive index of water is 1.33

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1.0 m

1.5 cm

2.0 m

2.5 m

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

The phenomenon of total internal reflection occurs in

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Optical fibre

Rainbow

Mirage

All of these

Rainbows and mirage are formed by

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Reflection only

Refraction only

dispersion only

A combination of refraction, total internal refraction and dispersion

An image formed on the film of camera is

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Real , inverted and diminshed

Virtual, inverted and diminshed

Real upright and diminished

Virtual, upright and idminshed

A negative magnification always means the the image is.

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Erect

Real

Virtual

Inverted

Spherical aberration can be removed by using

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Concave lens

Convex lens

By limiting the number of rays using a stopper

By using a concave convex lens

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

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Ophthalmology

Radiology

Cardiology

Andrology

Image formed by a concave lens is.

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Real

Magnified

Virtual

Real and magnified

If a single convex lens is placed closed to the eye then it can be used as

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Telescope

Simple microscope

Compound microscope

Opera glass

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

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f

2f

f/2

zero

A leser beam may be used to measure very large distance because it is.

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Unidirectional

Cohernet

Monochromatic

Not absorbed

Fiber optics system can be used for.

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Word processing

Image processing and receiving

Image transmitting

All of the above

Which term is used for human eye deflect near sightedness.

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Myopia

Hypermetropia

Presbyopia

Calaract

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

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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