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Physics > Light - Reflection & Refraction > Flashcards

Light - Reflection & Refraction Flashcards

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1
Q

Light travels in ____ line.

A

Straight

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2
Q

What is diffraction of light?

A

When an opaque object is so small,light bends instead of travelling straight.

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3
Q

Theory of light states that light is neither a ____ nor a ____.

A

Wave, Particle

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4
Q

Principal axis is _____ to the mirror at its pole.

A

Normal

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5
Q

What is an aperture?

A

The diameter of the reflecting surface of a spherical mirror

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6
Q

When is an image formed?

A

When two rays intersect.

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7
Q

What are the uses of concave mirror?

A

Torches, search lights, vehicle headlights, shaving mirrors, used by dentists, solar furnaces

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8
Q

Why does the light rays come back along the same path when a ray passes through centre of curvature?

A

Because the incident ray fall on the mirror along with the normal.

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9
Q

In what mirror can you see a full length image of an object?

A

Convex mirror

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10
Q

What mirror is fitted in a wall of Agra fort facing the Taj Mahal?

A

Convex mirror

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11
Q

What are the uses of convex mirror?

A

Rear view mirrors, device to check thefts

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12
Q

All distances parallel to the principal axis are measured from the ____ of the mirror.

A

Pole

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13
Q

A negative magnification indicates the image is _____ and a positive magnification indicates the image is____.

A

Real ; Virtual

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14
Q

The height of the object is positive or negative?

A

Positive.

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15
Q

Does light travel in the same direction in all media?

A

No

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16
Q

What is optically denser and rarer medium?

A

A medium in which the speed of light is more is known as rarer medium and vice versa.

17
Q

What happens when light enters from a rarer to denser medium?

A

Light bends towards normal.

18
Q

What is the speed of light in vacuum?

A

3 x 10^8 m s-1

19
Q

What is absolute refractive index of the medium?

A

The refractive index of any medium with respect to vacuum or air

20
Q

A media with a larger refractive index is optically denser or rarer?

A

Denser

21
Q

What is a lens?

A

A transparent material bound by two spherical surfaces.

22
Q

What happens to a ray of light passing through the optical centre of a lens?

A

It passes without any deviation.

23
Q

What are thin lenses?

A

Lenses whose aperture is smaller than its radius and 2 centres of curvature.

24
Q

Plural of principal focus

A

Principal foci

25
Q

The ability of a lens to diverge or converge depends on its

A

Focal length

26
Q

S.I unit of power of lens

A

Dioptre

27
Q

Power is expressed in dioptres only if focal length is expressed in

A

Meters

28
Q

Value of root 2

A

1.414

29
Q

Value of root 3

A

1.732

30
Q

n of water with respect to glass is

A

Glass / Water

Physics (2 decks)

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