Question # 1

The centre of spherical mirror is called:

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Focus

Axis

Centre

Pole

Focal length for concave mirror is :

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-ve

+ve

same

none of these

The mirror whose inner surface is reflecting is called:

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Concave mirror

Convex mirror

Miroor

Lens

Power of lens is:

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q/p

1/q

1/p

1/f

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

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

The refractive index of air is:

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6

7

2

1,0003

The focal length is related to radius of curvature by the formula:

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f = 2R

f = 4R

f = R/2

R = f/2

For a normal person audible frequency range for sound wave lies between:

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10 Hz and 10kHz

20Hz and 20 kHz

25 Hz and 25 kHz

30Hz and 30 kHz

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

From which of the following we can get information almost about everything:

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Book

Teacher

Computer

Internet

The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be:

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Absorbed

Totallly reflected

Partially reflected and partially transmitted

Totally transmitted

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

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Dioptre

Volt

Ampere

Watt

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