Question # 1

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

Spherical mirrors are used in:

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Medical

Search light

Microscope

All of these

Optical fibre are:

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Cheap

Flexible

Lighter

All of these

The point through which rays of light pass after reflection from concave mirror is called principal:

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Focus

Circle

Axis

Radius

The totally reflectiing prism one angle is of:

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45^o

90^o

180^o

120^o

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

Totally reflecting prism is used in:

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periscope

binoculars

periscope and binocular

telescope

The distance of spherical mirror is called:

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Curvature

Aperture

Sphere

a,b

A normal eye can see near objects clearly at a distance of:

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20 cm

25 cm

30 cm

35 cm

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

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refraction ray

incident ray

reflected ray

emergent ray

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

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

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

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