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Physics Gcse > Light Physics gcse > Flashcards

Light Physics gcse Flashcards

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1
Q

what is the law of reflection

A

Its when a ray of light reflected from a plane surface, The angle of reflection is equal to the angle of incidence

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2
Q

What are the properties of an image in a plane mirror

A
  • Laterally inverted
  • Same size
  • Same distance
  • Virtual image
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3
Q

What is the definition of Virtual image

A

It is an image that cant be focused onto a screen

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4
Q

What happens to light traveling into a glass block

A

The light bends towards the normal (slows down)

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5
Q

What is the definition of Refracted

A

when something Changes directions

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6
Q

What is dispersion

A

When white light is separated into 7 colours using glass prism

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7
Q

what are the 7 colours of the visible spectrum in order

A 
Red
Orange
Yellow 
Green 
Blue 
Indigo 
Violet
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8
Q

Why does dispersion happen

A

As all colours of the visible spectrum travel at the same speed in a vacuum (or air) But colours have different frequencies therefore different wavelength meaning they slow down by different amounts when entering glass so they refract at different amounts

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9
Q

What colour has the biggest wavelength

A

Red

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10
Q

What colour bends the most through prism

A

Violet

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11
Q

What colour slows down the least when passing through a prism

A

Red

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12
Q

What colour slows down the most when passing through a prism

A

Violet

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13
Q

Define the critical angle

A

When the angle of incidence is in an material (air, glass), the angle of refraction in air is 90 degrees

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14
Q

What is in the critical angle for glass

A

42 degrees

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15
Q

What are the uses for total internal reflection

A

Periscopes

Reflectors

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16
Q

What is total internal reflection

A

When the ciritical angle is over 42 and there is no refraction.

17
Q

What are fibre-optic used for

A

Used in communication for carrying signals.

An endoscope.

18
Q

Advantages and disadvantages of communications (fibre optic)

A

Advantages- Carry more information than copper at the same diameter.
Disadvantages- Signal needs to be boosted every few km

19
Q

Advantages and Disadvantages of endoscopy (Fibre optic)

A

Advantages- See inside patients body without needing large hole.
Disadvantages- May be uncomfortable, cause sore throat

20
Q

what happens when the angle of incidence is above 42 degree

A

Total internal reflection

Physics Gcse (8 decks)

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