[physics] thin converging lens Flashcards

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1
Q

what is the principal axis

A

the line which passes through the centre of the lens and is perpendicular to the plane of the lens

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2
Q

principal focus/principal focal point

A

the point on the principal axis where all the rays parallel to the principal axis meet after passing through the lens

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3
Q

symbol for principal focus

A

F

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4
Q

focal length

A

distance between optical centre and the principal focal point

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5
Q

symbol for focal point

A

F

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6
Q

optical centre

A

point of the principal axis that is the midpoint between the surface of the lens

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7
Q

symbol for optical centre

A

C

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8
Q

focal plane

A

plane perpendicular to the principal axis on which all parallel rays meet after passing through the lens

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9
Q

special thing to note about

A

when the parallel beam of rays incident on a thin converging lens is not parallel to the principal axis, the rays are reflected to a point P on the focal plane

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10
Q

u=infinity

A
  • inverted
  • real
  • diminished
  • opposite
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11
Q

uses of u=infinity

A

telescope

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12
Q

u>2f

A
  • inverted
  • real
  • diminished
  • opposite
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13
Q

uses of u>2f

A

camera/eye

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14
Q

u=2f

A
  • inverted
  • real
  • same size
  • opposite
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15
Q

uses of u=2f

A

photocopier

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16
Q

f<u<2f

A
  • inverted
  • real
  • magnified
  • opposite
17
Q

uses of f<u<2f

A

projector

18
Q

u=f

A
  • upright
  • real
  • magnified
  • same side
19
Q

uses of u=f

A

spot light

20
Q

u<f

A
  • upright
  • real
  • magnified
  • same side
21
Q

uses of u<f

A

magnifying glass

22
Q

draw out all the graphs

A

refer to notes