Question # 1

An object is 14 cm is front of a convex mirror. The image is 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

Which of the following is not processing:

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Arranging

Manipulating

Calculating

Gathering

Which form of energy is sound:

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Electrical

mechanical

Thermal

Chemical

How does sound travel from its source to your ear:

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By changes in air pressure

By vibration in wires or strings

By electromagnetic waves

By infrared waves

Concave mirror formula is given by:

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R = 2r

sin<i/sin<r

1/f=1/p+1/q

1/f=1/p-1/q

The refractive index of air is:

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6

7

2

1,0003

If focal length of a lens is 1m, then its power will be:

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1 D

0.5 D

1.5 D

1 D

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

The distance of image from mirror is represented by:

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q

p

F

m

The S.I unit of power of a lens is:

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Dioptre

Volt

Ampere

Watt

The angle of which prism deviates the incident ray is called:

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angle of incident

angle of reflection

angle of deviation

angle of minimum deviation

The line which passes through pole of the mirror and center of curvature is called principal:

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axis

Focus

Line

None of these

The refractive index of internal coating of optical fibre is:

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1.56

1.51

1.53

1.58

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