Question # 1

Power of convex lens is 10 D. Its focal length is:

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100 m

10 m

1 m

0.1 m

The distance between principal focus and pole of mirror is called:

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Princpal focus

Focal length

P

Image

Snell' law is:

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n = sin<x/sin <r

n=sin <i/sin<r

n = sin <r/sin<i

<i/<r

An object of placed at he 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

Angle opposite to the base of triangle of prism is called:

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angle of incidence

angle of refraction

angle of prism

emerging angle

Which of the following quantities is not change during refraction of light?

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Its direction

Its speed

its frequency

Its wavelength

The distance between two consecutive waves compressions or rarefactions is called:

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Focal length

Wave length

Frequency

Time period

The totally reflectiing prism one angle is of:

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45^o

90^o

180^o

120^o

Speed of light in air is ms^-1

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3 x 10⁸

3 x 10¹¹

3 x 10⁵

340

In totally reflecting prism one angle is of 90^o, and other two angles are of:

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30^o,30^o

45^o,90^o

45^o,45^o

40^o,40^o

The ray of light striking to the side of prism is called:

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refraction ray

incident ray

reflected ray

emergent ray

In a convex mirror the size of the image:

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Is smaller than the size of the object

Is greater than the size of the object

Depends upon the position of the object

Is equal to the size of the object

Which form of energy is sound:

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Electrical

mechanical

Thermal

Chemical

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