Physics

A non-spherical eyeball is called what?
Astigmatism
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What type of lens helps someone who is short sighted?
Convex Lens
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What is the distance from the centre of the lens to the principal focus called?
The focal length
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When the image is formed where the light appears to come from the image is called...?
Virtual
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Convex lens refract the light to...?
Converge on a point
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What makes a lens flatter and thinner?
Higher refractive index
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For an image to be real and inverted on a converging lens where does the object have to be?
Further away from the lens than the principal focus.
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If images are formed behind the eyeball then the person is...?
Long Sighted
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What is the unit for a power of the lens?
Dioptres
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What requires more energy: Helium Fusion? Or Hydrogen Fusion?
Helium Fusion
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How long is a solar day?
24 Hours
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Roughly how long does it take for the Moon to orbit the Earth?
28 Days
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How long is a side real day?
23 Hours 56 Minutes
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6. What unit of measurement is used when measuring how far away distant galaxies are?
Megaparsecs
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What does parallax enable astronomers to do?
Measure the distance of visible stars
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What two factors affect the luminosity of a star?
Size and Temperature
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In a simple telescope which is more powerful? Eyepiece? or Objective?
Eyepiece
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What do spectrums of the light produced by stars show?
The elements in the star.
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What part of star emits EM radiation into space?
Photosphere
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Name the person correct about the number of galaxies in Our Universe?
Curtis
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What is the order of least to most ionising radiation?
Gamma, Beta, Alpha
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How many neutrons does an alpha particle have?
2
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What is the order of most to least ionising radiation?
Alpha, Beta, Gamma
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Other cards in this set

Card 2

Front

What type of lens helps someone who is short sighted?

Back

Convex Lens

Card 3

Front

What is the distance from the centre of the lens to the principal focus called?

Back

Preview of the front of card 3

Card 4

Front

When the image is formed where the light appears to come from the image is called...?

Back

Preview of the front of card 4

Card 5

Front

Convex lens refract the light to...?

Back

Preview of the front of card 5
View more cards

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