Question # 1

A component of the spectrometer which consists of a fixed metallic tube with a coned lens at one end and an adjustable slit is called.

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Telescope

Collimator

Tumtable

Grating

A lens whose thickness is small as compared to focal length is a

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Concave lens

Double concave lens

Convex lens

Plano concave lens

When of the following colours scatters minimum.

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Blue

Violet

Yellow

Red

Which part of hole located in the centre of the eye that allows light to enter the retina.

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Iris

Pupil

Cornea

Fovea

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

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

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

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 maximum number of rays required by a lens to form an image are

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2

3

4

Infinite

Power of the lens is one dioptre, if its focal length is.

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1/6 metre

1/2 metre

1 metre

8 metre

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

The length of Galilean telescope is given by

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fo + fe

fo- fe

1/fo - 1/fe

1/fo = 1/fe

The ability's of convex lens to produce convergence in a parallel beam is called its.

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Magnification

Focal length

Power

Strength

Which is the light sensitive tissue in human eye

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Retina

pupil

Iris

Cornea

The length of an astronimical telescope for normal vision is.

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fo x fe

fe/fe

fo - fe

fo + fe

Which of the following are defects is lenses.

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Chromatic aberration

Spherical aberration

Astigmation

All of the above

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

Which phenomenon is responsible formation of shadows.

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Interference of light

Diffraction of light

Polarization of light

Propagation of light

The erecting lens of a telescope produces

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A shorter instrument

wider field of view

A larger image

A sharp image

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

A Galilean telescope with objective of coal length 30 cm and eyepiece of focal length.8 cm when focused for infinity has length equal to

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7.5 cm

2.2 cm

38 cm

240 cm

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