Question # 1

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

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refraction ray

incident ray

reflected ray

emergent ray

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90^o is called:

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angle of incidence

critical angle

angle of refrection

None of these

The mirror whose inner surface is reflecting is called:

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Concave mirror

Convex mirror

Miroor

Lens

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

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

Snell's law is stated as:

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Sin i / sin r = n1/n2

sin i / sin r = n2/n1

sin r / sin i = n2/n1

sin r / sin i = 2n2/n1

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

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

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Dioptre

Volt

Ampere

Watt

Which types of image is produced by the converging lens of human eye if it view a distant object?

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Real , erect, same size

Real, inverted, diminshed

Virtual, erect,diminshed

Virtual, inverted, magnified

Which types of image is formed by a concave lens on a screen?

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Inverted and real

Inverted and virtual

upright and real

Upright and virtual

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

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

Half of radius of curvature is called:

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Focal length

Principal focus

Axis

None of these

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