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Physics > Light-Reflection > Flashcards

Light-Reflection Flashcards

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1
Q

define light

A

light is form of energy which is a part of the electromagnetic spectrum. It posesses rectilinear propgation and does not requre any medium for its propogation

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2
Q

define reflection

A

reflection is the process of bouncing back of light into the same medium after striking a surface.

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3
Q

state the two laws of reflection

A
  • the incident ray, reflected ray and normal to the reflecting surface all lie on the same plane.
  • the angle of incidence is always equal to the angle of reflection.
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4
Q

what are the two types of images and define them

A

real image
-if the rays of light from an image after reflection actually meet a point then a real image is formed

virtual image
-when a beam of light from an object, after rflectiin, does not actually meet at a point but seems to diverge from it, then the image is a virtual image.

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5
Q

differenciate between real and virtual image

A

real image

  • formed when light rays actually meet at a point after reflection
  • image is always inverted
  • image is formed in front of a mirror
  • it can be obtained on a screen
    ex: concave mirror

virtual image

  • light rays do not meet at a point after reflection but appear to diverge from it
  • image is erect
  • image cannot be obtained on a screem
  • image is formed behind a miror
    ex: plane mirror,convex miroor
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6
Q

characteristics of image formed by a plane mirror

A
  • image formed is virtual and erect
  • size of the image is equal to the size of the object
  • the distance between the object and the mirror is equal to the distance between the image and the mirror
  • the image formed is laterally inverted
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7
Q

define spherical mirror

A

a mirror whose reflecting surface is curved or a part of a hollow sphere is called a sphericla mirror

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8
Q

define concave mirror

A

a spehrical mirror whose reflecting surface is curved inward is called a concave mirror

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9
Q

define convex mirror

A

a spherical mirror whose reflecting surface is bulged outward is called a convex mirror

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10
Q

what is the pole of the mirror

A

the centre of the reflecting surface of a spherical mirror is caled the pole of the mirror
denoted by :P

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11
Q

what is the centre of curvature

A

centre of curvature is the centre of the hollow sphere of which the spherical mirror forms a part of.
denoted by:C

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12
Q

what is radius of curvature

A

radius of curvature is the radius of the hollow sphere of which the spehrical mirror forms a part of,
denoted by: R

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13
Q

define principal axis

A

principal axis is the imaginary line passing throuhg the cetnre of curvature and pole of the mrror

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14
Q

define focus of a concave mirror

A

rays parallel ot principal axis after refletion converge at a point on the principal axis caled the focus of a concave mirror
denited by:F

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15
Q

focallenght

A

distance between P and F

R=2f

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16
Q

rules for image formation on concave mirror

A

i) a ray parallel to the principal axis, after reflection, passes through the focus
ii) a ray which passes through the focusafter reflection moves parallel to the principal axis
iii) a ray which passes through the centre of curvature after relfection retraces its path.
iv) a ray which is incident at the pole obliquely gets reflected obliquely making the same angle.

17
Q

rules for image formation on convex mirror

A

i) a ray which is paralllel to the principal axis after reflection diverges and appears to come from the focus
ii) a ray directed towards the focus after reflection moves parallel to the principal axis
iii) a ray directed towards the centre of curvature retraces its path
iv) a ray which is incident at the pole obliquely gets reflected back obliquely making the smae angle

18
Q

define regular reflection

A

when parallel rays of light strike a smooth and highly polished surface then the relfected rays of light are also parallel and are directed towards the same direction.This is known as regular reflection

19
Q

define irregular reflection

A

when parallel rays of light strike a rough surface with irregularities, the reflected light is not parallel but spreads over a large area. This is known as irregular reflection.

20
Q

define normal

A

the perpendicular to the reflecting surface at the point of incidence

21
Q

define incident ray

A

the ray of light which striked the reflecting surface

22
Q

define relfected ray

A

they ray of light which is bouncing back/ reflected form the relfecting surface at the point of incidence.

23
Q

what is the focus and radius of curvature of a plane mirror

A

focus: ∞

radius of curvature=0

24
Q

define linear magnification

A

linear magnification is the ratio of the height of the image to the height of the object.
m=hᵢ/hₒ

25
Q

define mirror formula

A

mirror formula is the equation which gives the relationsip between focal length, image distance and object distance.

1/v+1/u=1/f

26
Q

define ray

A

a ray of light is the path followed by light energy in a transparent medium

27
Q

define beam

A

a group of parallel rays of light emitted by a source of light is called beam

Physics (22 decks)

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