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

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

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Its direction

Its speed

its frequency

Its wavelength

Power of lens is:

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q/p

1/q

1/p

1/f

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

The centre of spherical mirror is called:

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Focus

Axis

Centre

Pole

Mathematical relationship between critical angle "C" and refractive index "n" is:

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N = C

N = 1 / sin c

N = 1 / cos c

N = 1 / sin2 c

A converging mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?

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5.0 cm

7.5 cm

15 cm

20 cm

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

Image formed on a camera is:

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real,invertred, and diminished

virtual, upright and diminshed

virtual, upright and magnified

real, inverted and magnified

Which of the following is not processing:

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Arranging

Manipulating

Calculating

Gathering

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

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

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