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Physics > Reflection Of Light > Flashcards

Reflection Of Light Flashcards

1
Q

Light is a form of energy called _____ energy.

A

Luminous

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2
Q

_____ are sources of light that generate and emit light by themselves.

A

Self luminous/luminous sources of light

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3
Q

______ bodies depend on natural or artificial light sources to illuminate them.

A

Non-luminous

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4
Q

Light is an ______ wave.

A

Electromagnetic

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5
Q

If a large percentage of light falling on a body passes through it, the body is said to be _______

A

Transparent

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6
Q

Objects which let small amount of light pass are called _____

A

Translucent

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7
Q

Objects which do not allow any light to pass through them are called _____

A

Opaque

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8
Q

A ______ is the direction or path along which light energy flows

A

Light ray

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9
Q

A collection of rays is called a ______

A

Beam

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10
Q

There are 3 types of rays.

Parallel, ______ and ______

A

Convergent and divergent

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11
Q

A _______ beam is one in which rays meet at a point. They are produced from a large source.

A

Convergent

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12
Q

A ______ beam is one which the light rays spread out from a point. They are produced from a small source.

A

Divergent

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13
Q

Rays of light are produced in the laboratory by means of ______

A

Ray box

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14
Q

The phenomenon of light traveling in straight line is known as _____

A

Rectilinear propagation of light

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15
Q

Two natural effects that result from the rectilinear propagation of light are the formation of _______ and _______

A

Shadows and eclipses

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16
Q

A ______ is an area in which light rays from a source cannot reach

A

Shadow

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17
Q

A shadow is produced by the obstruction of light by an ______ object.

A

Opaque

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18
Q

The completely dark area of a shadow is called ______ and the outer light/grey area is called ________

A

Umbra and penumbra/partial shadow

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19
Q

In the umbra region, light is _____ blocked by opaque body and in the penumbra region, the light is ____ blocked by the opaque object

A

Completely and partially

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20
Q

An ______ is a result of a shadow cast by one heavenly body on another

A

Eclipse

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21
Q

_______ occurs when the moon comes between the sun and earth

A

Eclipse of the sun/solar eclipse

22
Q

_______ occurs when the earth comes directly between the sun and the moon. When the moon is on the opposite side of the earth, this occurs.

A

Eclipse of the moon

23
Q

______ occurs when the earth and moon are in positions where their rays intersect at the edge of the moon before reaching the earth.

A

Annular eclipse

24
Q

_____ is defined as the ratio of the size (or height) of the image to the size (or height) of the object.

A

Magnification

25
Q

Formula for magnification, M is ______

A

M= size (height) of image/size (height) of object
=distance of image from pinhole/distance of object from pinhole
=length of camera/distance of object from pinhole

26
Q

Two types of reflection are: _____ and ______

A

Regular and scattered/diffuse

27
Q

Regular Reflection

A

Parallel rays of light incident on a smooth or polished surface are reflected as parallel rays in one direction

28
Q

Diffused/Irregular/Scattered Reflection

A

Parallel rays of light incident on rough or irregular surface as reflected in various directions.

29
Q

Laws of Reflection

A
  1. The incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane.
  2. The angle of incidence (i) is equal to the angle of reflection (r)
30
Q

Angle which incident ray is deviated is ____

A

180 - (i+r)

=180 - 2i

31
Q

Principal of reversibility of light states that ______

A

The path of a light ray is reversible

32
Q

Virtual image

A

Is one that cannot be caught on a screen. Light rays do not pass but it is visible to the eye.

33
Q

Real image

A

Is one that can be caught on screen. Light rays pass through it.

34
Q

______ is the apparent relative movements of two aligned objects when they are not at the same distance from an observer.

A

Parallax

35
Q

_______occurs when the appearance of an image in the mirror looks like the reversal of the object.

A

Lateral inversion

36
Q

Characteristics of images formed by plane mirror.

A
  1. It is the same size as the object.
  2. It is virtual
  3. It is literally inverted
  4. It is as far behind the mirror as the object is in front of the mirror.
  5. It is upright.
37
Q

Images formed by an inclined mirror formula:

A

n= (360/theta) - 1

Where n is number of images
Theta is the angle between the two mirrors.

38
Q

Two types of curved mirrors

A

Concave and convex

39
Q

Concave mirror/ converging mirror

A

Inside surface is silvered and outside surface is the reflecting part

40
Q

Convex/diverging mirror

A

Outside surface is silvered and inside surface is reflecting part

41
Q

Aperture

A

Width of the mirror

42
Q

Pole

A

Center of the reflecting surface of the curved mirror

43
Q

Center of curvature

A

Center of the sphere of which the mirror forms a part

44
Q

Radius of curvature

A

The radius of the sphere of which the mirror forms a part

45
Q

Principle axis

A

Distance from pole to center of curvature

46
Q

Principal focus of curved mirror

A

The point on one axis to which incident rays parallel and close to the principal axis converge or from which they appear to diverge after reflection

47
Q

Focal length

A

Is the distance from the principal focus to the pole
It is half the radius of curvature
f=r/2

48
Q

Practical applications of concave mirrors

A

Shaving mirrors

Parabolic mirrors uses in searchlights and car headlamps

49
Q

Practical applications of convex mirrors

A

Driving mirrors because they have a wide field of view

50
Q

Convex mirror always forms a ___

A

Virtual, diminished and erect image, irrespective of position of object from mirror

51
Q

Concave mirror forms _____

A

Real and inverted images

52
Q

A concave mirror ____ incident parallel rays.

A convex mirror ____ incident parallel rays.

A

Converges

Diverges

Physics (2 decks)

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