Question # 1

Power of lens is:

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q/p

1/q

1/p

1/f

Power of convex lens is 10 D. Its focal length is:

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100 m

10 m

1 m

0.1 m

The principal focus of a concave mirror is:

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Virtual

Real

Imaginary

Dual aspect

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 mirror whose outer surface is reflecting is called:

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Concave mirror

Convex mirror

Lens

Mirror

Snell' law is:

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n = sin<x/sin <r

n=sin <i/sin<r

n = sin <r/sin<i

<i/<r

____________ is always virtual in case of convex mirror.

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p

image

object

all of these

When the object is placed beyond 2F of a convex lens, the image formed will be:

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Real, inverted and smaller than the object

Real, inverted and of the same size as the object

Real, inverted and larger in size than the object

Virtual, erect and larger in size than the object

The refractive index of air is:

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6

7

2

1,0003

An example of input device computer is:

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Keyboard

printer

monitor

RAM

A data storage device is:

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Printer

Hard disk

Monitor

CPU

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

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

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