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 is the light sensitive tissue in human eye

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Retina

pupil

Iris

Cornea

Which instrument measures the magnification of a telescope.

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lactometer

dynamometer

Wattmeter

Ammeter

In case of a convex lens, image formed at 2 F is

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Virtual, erect and larger than the object

Real, inverted and large than the object

Real, inverted and same size as the object

Real, inverted and smaller than the object

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

Due to which phenomenon, diamond shrines so brightly.

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Scattering of light

Refraction of light

Dispersion of light

Total internal reflection

The function of collimator in spectrometer is to

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Disperse the light

Reflect the light

Make the light parallel

Diffract the light

Fiber optics system can be used for.

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Word processing

Image processing and receiving

Image transmitting

All of the above

Parallel rays of light are focused by a thin convex lens.A thin concave lens of the name focal length is then joinjed to the convex lens The focal point will.

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Shift to infinity

shift towards the lens by a small distance

shift away from he lens by a small distance

Remain at its original position

Larger the diameter of the objective of a telescope.

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Greater is its resolving power

Lesser is its resolving power

Lesser is its magnifying power

greater is its magnifying power

When light enters a denser medium

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Its speed slows down

Its speed increases

It is totally reflected

Its speed remains unchanged

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

What is true is real images formed by a converging lens.

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they are inverted

They are on the same side of the lens as the object

They can never be shown on a screen

They cannot be seen

The ability of eye to focus near as well as distant object is termed as.

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Myopia

Persistence of vision

Power of accommodation

Astigmatism

Why danger signals are made red.

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Our eyes are more sensitive to real colour

Red colour has minimum scattering

Red colour has maximum scattering

Red colour has maximum frequency

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

The power of convex lens is 10 d. At what distance the 3 times larger image is formed.

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9.6 cm

2.3 cm

13.3 cm

17.6 cm

In case of a convex lens, when object is placed at F

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the image is formed beyond 2 F

the image is formed between F and 2 F

No image is formed

the image is formed behind the object

A real object paled inside the focus of a convex lens gives

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Real image but diminshed

Real image but enlarged

virtual image but diminished

Virtual image but enlarged

The bending of light when it enters a medium

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Reflection

Refraction

Diffraction

Total internal reflection

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

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