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Physics > Light - Reflection and Refraction > Flashcards

Light - Reflection and Refraction Flashcards

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1
Q

The area of concave mirror that is exposed to incident light is called __________

A

aperture

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2
Q

Principal axis is the line joining the pole and the ____________.

A

center of curvature

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3
Q

The radius of curvature of a plane mirror is ___________.

A

infinte

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4
Q

The distance between the pole and centre of curvature of a spherical mirror is called _________ .

A

radius of curvature

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5
Q

Spherical mirror with a reflecting surface curved ____________ is called a convex mirror.

A

outwards

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6
Q

The point on the principal axis at which parallel rays converge after reflection from a concave mirror is called the ___________.

A

focal point

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7
Q

An image formed when the light rays do not actually pass through the image location, and would not appear on paper or film placed at that location is referred to as a real image.
(true/false)

A

true

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8
Q

Focus is real in the case of a concave mirror.

A

true

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9
Q

Concave spherical mirrors produce images which can be both real and virtual.

A

true

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10
Q

The diameter of the reflecting surface of a spherical mirror is called aperture.

A

false

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11
Q

What is diffraction of light.

A

If an opaque object on the path of light becomes very small, light has a tendency to bend around it and not walk in a straight line

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12
Q

Real image is formed on the ________ side of the mirror .

A

left side i.e. that is in front of the mirror

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13
Q

Virtual image is formed on the ______ side of the mirror

A

right side i.e. behind the mirror

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14
Q

State some uses of CONCAVE MIRROR and their reason

A
  1. torches, search lights, headlights as the bulb is fixed on focus, the reflected rays become parallel and give uniform illumination.
  2. Shaving mirrors - to see a larger image of face
  3. Dentist - As the mirror is bought close to the teeth i.e. the object is b/w P & F so the image formed id erect, virtual and enlarged
  4. Large concave mirror are used to concentrate sunlight to produce heat in solar furnaces
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15
Q

A spherical mirror, whose reflecting surface is curved

inwards is called

A

Concave Mirror

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16
Q

A spherical mirror whose reflecting surface is curved

outwards, is called

A

Convex Mirror

17
Q

What are the uses of Convex mirror ?

A
  1. Convex mirrors are commonly used as rear-view (wing) mirrors in vehicles. These mirrors are fitted on the sides of the vehicle, enabling the driver to see traffic behind them to facilitate safe driving.
  2. Also, they have a wider field of view as they are curved outwards. Thus, convex mirrors enable the driver to view much larger area than would be possible with a plane mirror.
  3. Convex mirrors are preferred because they always give an erect, though diminished, image.
18
Q

Set of Sign Convention is called the_______________

A

New Cartesian Sign Convention

19
Q

What is the “Mirror Formula” ?

A

1/f = 1/u + 1/v

20
Q

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

A

Light bends away from the normal

21
Q

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

A

Light bends towards the normal

22
Q

What is the Snell’s law of refraction ?

A

The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given colour and for the given pair of media.

23
Q

A ray of light through the optical centre of a lens passes w/o suffering any deviation (true /false)

A

True

24
Q

Centre of an aperture in a lens is called ________ and is denoted by ________

A

optical centre, O

25
Q

What is the lens formula?

A

1/v - 1/u = 1/f

26
Q

the degree of convergence or divergence of light rays achieved by a lens is expressed in terms of its _____________

A

power

27
Q

The power of lens is defined as the reciprocal of ___________

A

focal length i.e. P = 1/f

28
Q

What is the S.I. unit of Power? and what is it denoted by ?

A

dioptre and is denoted by ‘D’

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