Question # 1

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

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

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

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

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Book

Teacher

Computer

Internet

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 centre of spherical mirror is called:

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Focus

Axis

Centre

Pole

An example of input device computer is:

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Keyboard

printer

monitor

RAM

The index of refraction depends on:

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The focal length

The speed of light

the image distance

The object distance

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

If a ray of light is glass is incident on an air surface at an angle greater than the critical angle, the ray will.

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refract only

reflect only

partially refract and partially reflect

Diffract only

Snell' law is:

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n = sin<x/sin <r

n=sin <i/sin<r

n = sin <r/sin<i

<i/<r

Optical fibers work on the principle of:

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Refraction

Reflection

Total internal reflection

Diffraction

Astronauts in space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space

Sound waves travel very fast in space

Sound waves cannot travel in space

Sound waves have low frequency in space

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