Question # 1

The centre of spherical mirror is called:

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Focus

Axis

Centre

Pole

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

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Focal length

Wave length

Frequency

Time period

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 refractive index of air is:

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6

7

2

1,0003

Snell' law is:

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n = sin<x/sin <r

n=sin <i/sin<r

n = sin <r/sin<i

<i/<r

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

The critical angle for glass to:

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24^o

48^o

42^o

50^o

The index of refraction depends on:

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The focal length

The speed of light

the image distance

The object distance

Critical angle for diamond is:

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60^o

24^o

26^o

49^o

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

An object is placed 6 cm away in front of a concave mirror that has 10 cm focal length. Determine the location of the image:

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-5 cm

-10 cm

-15 cm

-20 cm

Which form of energy is sound:

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Electrical

mechanical

Thermal

Chemical

Spherical mirrors are used in:

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Medical

Search light

Microscope

All of these

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Physics 10th Class English Medium Unit 3 Online Test MCQs With Answers

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