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LC Physics > Light - Reflection of Light > Flashcards

Light - Reflection of Light Flashcards

1
Q

Laws of Reflection

A
  1. Angle of reflection (r) = Angle of incidence (i)

2. Incident ray, normal, reflected ray are all in same plane

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2
Q

Parallax

A
  1. Apparent relative movement of two objects due to movement of the observer
  2. Object that is farthest away appears to move with the observer
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3
Q

Self-luminous object

A

Object that gives out its own light

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4
Q

Non-luminous object

A

Does not give out its own light

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5
Q

Converging beam

A

Beam of light getting narrower

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6
Q

Diverging beam

A

Beam of light spreading out (like the light from a torch)

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7
Q

Parallel beam

A

Beam of light that remains the same width

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8
Q

Reflection of light

A

Bouncing of light off an object is called reflection

/light rebounding off surfaces

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9
Q

Diffuse reflection

A

If surface is rough, reflected light is scattered in all directions

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10
Q

Regular reflection

A

If surface is silvered + polihed smooth (eg. mirror), light falling on it is not scattered in all directions (it is reflected off)

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11
Q

Real image

A

Formed by the actual intersection of light rays, (can be seen on a screen)

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12
Q

Virtual image

A

Apparent intersection of light rays, can never be seen on a screen, but can be located by no parallax

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13
Q

Concave mirror formula for real image

A

in hardback

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14
Q

Concave mirror formula for virtual image

A

in hardback

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15
Q

Convex mirror formula

A

in hardback

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16
Q

Magnigication formula

A

on hardback

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17
Q

Convex mirror

A

Image is always virtual and diminished

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18
Q

Incident ray

A

Ray of light falling on mirror

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19
Q

Reflected ray

A

Ray of light leaving the mirror

20
Q

Normal at the point of incidence

A

Line drawn perpendicular to the mirror where ray strikes the mirror

21
Q

Angle of incidence

A

Angle between incident ray + the normal

Symbol is i

22
Q

Angle or reflection

A

Angle between reflected ray + the normal

Symbol is r

23
Q

Without light you cannot see

A

To be able to see an object, light from object must enter your eye

24
Q

Self-luminous object

A

Object that gives out its own light eg. the Sun, stars, fire, a bulb

25
Q

Non-luminous object

A

Object that does not give out its own light eg. when light from some other source bounces off object + goes into your eye

26
Q

Light

A
  • A form of energy

- Travels away from source producing it

27
Q

How we know light is a form of energy

A
  1. Other forms of energy is always needed to produce light eg. electrical energy is converted to light energy in a bulb
  2. Light can cause a photocell to produce electric current eg. solar panels
  3. Light shines on Crooke’s radiometer, vanes rotate (converts light energy to kinetic energy)
28
Q

Light travel

A

Light travels in straight lines

29
Q

Diverging beam

A

Beam of light spreading out (like light from a torch)

30
Q

Converging beam

A

Beam of light getting narrower

31
Q

Parallel beam

A

Beam of light that remains the same width

32
Q

Light ray

A

Straight line showing direction in which light is travelling

Very narrow parallel beam is a light ray since it is a straight light showing direction in which light is travelling

33
Q

Reflection

A

Bouncing of light off an object

34
Q

Use of plane mirrors

A
  1. Used to see yourself

2. Periscope

35
Q

Speed of light

A

3 x 10^8 m s^-1

36
Q

where is light detected in the eye?

A

retina

37
Q

two invisible parts of the electromagnetic spectrum with shorter wavelength than visible light

A
  • ultraviolet
  • x-rays
  • gamma rays
38
Q

pairs of complementary colours of light

A

red and cyan
green and magenta
blue and yellow

39
Q

concave mirrors, rather than convex mirrors, are used by dentists to examine teeth. Explain why

A

to give a magnified image

40
Q

a diverging lens cannot be used as a magnifying glass. Explain why

A

diminished image always formed

41
Q

diagram of the path of light through a lens close up

A

know

42
Q

why each fibre (fibre optic) is coated with glass of lower refractive index

A

so total internal reflection occurs and no light escapes

43
Q

When underwater: why does the cornea not act as a lens

A
  • light not refracted at cornea

- water and cornea have same n value

44
Q

When underwater: what is the max power of the eye?

A

maximum power of the internal lens

45
Q

When underwater: why do objects appear blurred?

A

-internal lens not powerful enough to focus light on retina / light not brought to a focus on the retina

46
Q

When underwater: how wearing goggles allows objects to be seen clearly

A
  • light refracted on passing from air to cornea

- cornea now acts as a lens

LC Physics (25 decks)

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