Question # 1

The distance of spherical mirror is called:

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Curvature

Aperture

Sphere

a,b

The refractive index of air is:

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6

7

2

1,0003

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

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

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

Which is an example of a longitudinal wave:

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Sound wave

Light wave

Radio wave

Water wave

____________ is always virtual in case of convex mirror.

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p

image

object

all of these

In a convex mirror the size of the image:

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Is smaller than the size of the object

Is greater than the size of the object

Depends upon the position of the object

Is equal to the size of the object

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 S.I unit of power of a lens is:

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Dioptre

Volt

Ampere

Watt

After refraction from a convex lens, rays of light parallel to the principal axis converge at a point, this point of convex lens is called:

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Principal focus

Pole

Focal length

Optical center

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

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

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refraction ray

incident ray

reflected ray

emergent ray

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