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Optics > 2. Reflection of Light > Flashcards

2. Reflection of Light Flashcards

1
Q

what can happen to light when it meets an interface between two media

A

absorbed
transmitted
reflected

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2
Q

laws of reflection

A

incident ray, reflected ray and the normal to the reflecting surface all lie in the same plane

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3
Q

angle of incidence

A

equals the angle of reflection

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4
Q

parallel light and irregular surface

A

gets scattered in many directions –> diffuse reflection

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5
Q

brain and ‘images’

A

brain assumes that an objected is situated in the direction form which lights enters the eye BUT if the observer actually goes to the point of the image – there is no real image

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6
Q

virtual images

A

could not be captured on a screen
((usually dotted line

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7
Q

real images

A

could be captured on a screen

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8
Q

image formed at a plane surface is

A

erect
virtual
laterally inverted

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9
Q

if a plane mirror is rotated

A

the reflected ray is deviate through an angle equal to TWICE the anlge of ROTATION of the mirror

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10
Q

spherical mirror

A

is the reflecting surface is a portion of a sphere

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11
Q

if the reflecting surface lies on the inside of the curve

A

concave

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12
Q

if the reflecting surface lies on the outside of the curve

A

convex

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13
Q

centre of curvature

A

= C
the centre of the circle (is the reflecting surface was extended to a whole circle)

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14
Q

pole of the mirror

A

= p
centre of the reflecting surface

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15
Q

radius of curvature

A

= r
distance between C to P

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16
Q

axis

A

axis is any line passing through the centre of curvature and striking the mirror

17
Q

principle axis

A

an axis passing through the centre curvature and striking the mirror AT THE POLE

18
Q

rays parallel to the principle axis are reflected

A

concave = towards the principal focus
convex = away from the principal focus

19
Q

principal focus

A

= F
this is the mid point of r (radius of curvature)
mid point between C and P

20
Q

focal length

A

= f (lower case)
distance between F and P
half the radius of the curvature

21
Q

an object situated on the principal axis at infinity

A

is formed on at the principal focus

22
Q

image formed by a concave mirror

A

real (infrontof lens)

23
Q

image formed by a convex mirror

A

virtual (behind lens)

24
Q

how to construct a ray diagram

A
  1. Ray parallel to principal axis reflected to/away from principal focus
  2. Ray from top of object passing through the centre of curvature and reflected back
25
Q

CONCAVE mirror
object outside C

A

real
inverted
diminished

26
Q

CONCAVE mirror
object between C and P

A

real
inverted
enlarged

27
Q

CONCAVE mirror
object inside principal focus

A

erect
virtual
enlarged

28
Q

CONVEX mirror
object at any point

A

virtual
erect
diminished

29
Q

position of the image formed calculation

A

1/v - 1/u = 1/f = 2/r
u = distance of the object from the mirror
v = distance if the image from mirror
f = focal length
r = radius of curvature

30
Q

definition of magnification

A

ratio of image size to object size

31
Q

magnification calculation

A

i / o = - (v / u)
i = image size
o = object size
v = distance of object from mirror
u = distance of image from mirror

32
Q

sign convention

A

distances measured in the same direction as the incident lgiht are positive
against the direction are negative

33
Q

all distances are measured

A

from the pole of the mirror to the point in questions

34
Q

image size is postive for

A

erect images (above the principal axis)

35
Q

image size is negative for

A

inverted images (below the prinicpal axis)

36
Q

Purkijne image I

A

Anterior cornea

Image - erect and virtual

Use - squint, keratometer

37
Q

Purkijne image II

A

Posterior cornea

Image - erect and virtual

Use - specular microscopy

38
Q

Purkijne image III

A

Anterior lens

Image - erect and virtual

Use - lens in accom

39
Q

Purkijne image IV

A

Posterior lens

Image - real and inverted

Use - lens in accom

Optics (18 decks)

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