Question # 1

The phenomenon of total internal reflection occurs in

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Optical fibre

Rainbow

Mirage

All of these

Which of the following is used for reducing spherical aberrations in optical instruments.

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Plano convex lens

Concave lens

Spherical mirrors

Piane mirrors

Which eye defect can be rectified by using diverging lens.

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Near sightedness

Far sightedness

presbyopal

Astigmatism

In optics, which subfield studies the measurement of electromagnetic radiation including visible light.

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Radiometry

Photometry

Telemetry

Chronometry

Power of lens is measured in

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cm

Metres

cm-1

Dioptres

Monochromatic light passing through a thick prism is.

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Polarize

Disperesed

Diffracted

Deviated

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

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

Image formed by a concave lens is.

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Real

Magnified

Virtual

Real and magnified

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

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

Linear magnification is equal to the ratio of.

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Size of the object to the size of the image

Size of the image to the size of the object

size of the object focal length

Size of the image focal length

Which of the following be used for redeciding mechanical aberration is optical instruments.

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Plane mirrors

Spherical mirrors

Concave lenses

Plano convex lenses

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

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

Which instrument measures the magnification of a telescope.

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lactometer

dynamometer

Wattmeter

Ammeter

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

The magnifying power of a convex lens of focal length 5 cm is

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3

5

6

20

A convex lens of focal length 6 cm to be used to from a virtual image three times the size of the object Where must the lens be placed.

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1 cm

2 cm

3 cm

4 cm

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

On which property of lens, longitudinal chromatic aberration depend upon

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Resolving power

Dispersive power

Magnifying power

Radius of curvature

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