Question # 1

The distance between two consecutive waves compressions or rarefactions is called:

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Focal length

Wave length

Frequency

Time period

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

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20 cm

25 cm

30 cm

35 cm

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 formed by a concave lens on a screen?

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Inverted and real

Inverted and virtual

upright and real

Upright and virtual

CD which is made of soft material is called:

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Hard disk

Floppy disk

Iron disk

Copper disk

Optical fibre are:

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Cheap

Flexible

Lighter

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

Hard disk is made of:

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Aluminium

Copper

Iron

Plastic

____________ is always virtual in case of convex mirror.

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p

image

object

all of these

An object is 14 cm is front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror?

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4.1 cm

8.2 cm

9.9 cm

20 cm

The totally reflectiing prism one angle is of:

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45^o

90^o

180^o

120^o

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

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Its direction

Its speed

its frequency

Its wavelength

The critical angle for glass to:

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24^o

48^o

42^o

50^o

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