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Physics > Optics Vocab > Flashcards

Optics Vocab Flashcards

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0
Q

Image (pinhole cameras)

A

The image which appears on the screen of the pinhole camera and resembles the object

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1
Q

Object

A

The thing giving off light

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2
Q

Inverted (pinhole cameras)

A

Image is upside down

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3
Q

Focused

A

Sharp/well defined image

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4
Q

Real (pinhole cameras)

A

A type of image which can be formed on a screen as light rays pass through the image

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5
Q

Umbra

A

Full shadow with clear edges

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6
Q

Penumbra

A

Shadow containing some light and blurred edges

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7
Q

Light

A

White appearance, contains all colours of rainbow, waves or photons, carries energy

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8
Q

Visible light

A

A form of energy detectable by human eyes

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9
Q

Luminous sources

A

Produce their own visible light eg. sun, filament, candle

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10
Q

Illuminated objects

A

Don’t give our light but reflect light from luminous sources into our eyes. Most objects are illuminated

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11
Q

Speed of light

A

3x10 8 m/s

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12
Q

Shadow

A

Formed when some light rays continue and others are impeded by an object

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13
Q

Law of reflection

A

Angle of incidence = angle of reflection

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14
Q

Solar eclipse

A

Moon covers sun (total- whole centre covered, partial- partially covered, annular- ring (if moon is further away than normal))

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15
Q

Lunar eclipse

A

Moon in earths shadow, moon goes dark

16
Q

Super imposed

A

Lots of images on top of each other

17
Q

Refractive index

A

Tells us how optically dense a material is:
Speed of light in vacuum/speed of light in material (that it enters)
OR n= Vv/Vm

18
Q

Critical angle

A 
The angle at which light is refracted along the top of a prism
Sin c (critical angle) = 1/n (refractive index)
OR n=sin i/sin r (i bigger)
19
Q

Total internal reflection

A

When a ray of light hits a transparent surface at more than the critical angle it is reflected

Physics (5 decks)

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