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Advanced Higher Physics > Interference and Polarisation > Flashcards

Interference and Polarisation Flashcards

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1
Q

How are interference patterns produced?

A

As a result of two different paths taken by two reflected waves

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2
Q

What is interference by division of amplitude?

A

It is caused by reflections of the boundaries between different materials

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3
Q

What are some applications of thin film interference?

A

Anti-reflection coatings on camera/telescope/binocular lenses

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4
Q

What are dark fringes?

A

Zones of destructive interference

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5
Q

What can be said about light and all other members of the EM spectrum?

A

They are all transverse waves

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6
Q

What do all EM waves consist of?

A

Two transverse compounds arranged at right angles to each other

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7
Q

What are the two transverse compounds that all EM waves are made of?

A

Electric field and magnetic field

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8
Q

What can be said about the structure of light rays?

A

A light ray has a 3D structure

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9
Q

What happens when we pass unpolarised light through a polariser?

A

All components of the electric fields at right angles to the axis of the polariser are blocked

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10
Q

What can be said about all components parallel to the axis of the polariser?

A

They are allowed to pass through

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11
Q

What does a reduction in intensity result in?

A

Results in a reduction in glare and thus improves image clarity

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12
Q

What do Polaroid filters allow?

A

All colours to pass through with only half of their original intensity

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13
Q

What can be said about the axis of transmission of the polariser and analyser?

A

They are parallel to each other

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14
Q

What can all incident light do?

A

All incident light is allowed to pass through the analyser

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15
Q

What can be said about instant light?

A

All instant light in the analyser is blocked

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16
Q

What are some ways of polarising light?

A

Passing light through Polaroids

Reflection

17
Q

What is the angle of incidence known as?

A

Brewster’s angle (ip)

18
Q

What is the equation for Brewster’s law?

A

tanip=n

19
Q

What must be the case for the reflected beam to be completely polarised?

A

ip+r must equal 90

20
Q

When is the reflected beam only partially polarised?

A

At any angle less than or greater than ip

21
Q

What is the critical angle?

A

The smallest angle in the glass that causes total internal reflection

22
Q

What is path difference?

A

The distance between the two rays of light

Advanced Higher Physics (8 decks)

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