Question # 1

Mathematical relationship between critical angle "C" and refractive index "n" is:

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N = C

N = 1 / sin c

N = 1 / cos c

N = 1 / sin2 c

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

In totally reflecting prism one angle is of 90^o, and other two angles are of:

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30^o,30^o

45^o,90^o

45^o,45^o

40^o,40^o

CD which is made of soft material is called:

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Hard disk

Floppy disk

Iron disk

Copper disk

The minimum value of angle of deviation is called:

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Minimum angle

incident angle

angle of minimum deviation

None of these

Focal length for concave mirror is :

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-ve

+ve

same

none of these

The centre of spherical mirror is called:

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Focus

Axis

Centre

Pole

The mirror whose inner surface is reflecting is called:

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Concave mirror

Convex mirror

Miroor

Lens

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

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

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 S.I unit of power of a lens is:

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Dioptre

Volt

Ampere

Watt

Optical fibers work on the principle of:

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Refraction

Reflection

Total internal reflection

Diffraction

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10th Class Physics Chapter 12 Geometrical Optics English Medium KPK Boards Online Mcqs MCQs With Answers

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