Science 2 > light waves > Flashcards

light waves Flashcards

(19 cards)

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1
Q

what is a light wave

A

an electromagnetic wave that is visible to the human eye

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2
Q

when light hits an object what can happen

A

reflect, refract or be absorbed

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3
Q

what is reflection

A

rebounding of light that occurs when light rays hit a different medium and bounce to the medium it came from

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4
Q

incident ray

A

one that comes from the light source to hit the surface of the object

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5
Q

reflected ray

A

ray that bounces back

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6
Q

normal

A

a line perpendicular to the surface at the point of reflection

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7
Q

angle of incidence

A

the angle between the incident ray and normal

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8
Q

angle of reflection

A

ray between the normal and the reflected ray

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9
Q

plane

A

the surface containing all the straight lines that connect any two points on it

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10
Q

what are the laws of reflection

A
  • ## the angle of incidence is always the same as the angle of reflection
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11
Q

what is a diffuse reflection

A
  • reflection in all directions
  • does not respect the laws of reflection
  • hitting a bumpy surface
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12
Q

what is a specular reflection

A

-follows all the laws of reflection because it is hitting a flat surface

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13
Q

what are the laws of specular reflection

A
  1. image is virtual
  2. image is the same size as the object
  3. image behind the mirror appears to be the same distance as the one in front of the mirror
  4. image is horizontally reflected
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14
Q

what is refraction

A
  • deviation of a light ray as it passes from one medium to another
  • changes the way we see an object
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15
Q

what is a converging lens

A
  • bring the light ays together
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16
Q

what is the focal point in converging lenses

Study These Flashcards
A

where the refracted rays meet when the incident ray runs parallel

17
Q

where is the secondary focal point in converging lenses

Study These Flashcards
A

along the principal axis at the same focal length on the other side

18
Q

what is a diverging lens

Study These Flashcards
A

disperse light rays

19
Q

where is the focal point in a diverging lens

Study These Flashcards
A

the virtual point from which the light rays appear to emanate when the incident rays run parallel

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