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5
×
In compound microscope, a --------------- mounted beneath the slides can be adjusted to give reflected light to object.
concave mirror
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5
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A magnifying glass that has a bi-convex lens with a short focal length is a
simple microscope
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What are two main types of electron microscope?
scanning electron microscope(SEM) and transmission electron microscope (TEM)
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banana
Go to last place!
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magnet
Take 25 points!
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fairy
Take points!
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25
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thief
Give points!
5
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25
5
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Binoculars use total reflecting prisms. Why?
Because of the successive total internal reflections prisms, the length of the telescope is greatly reduced.
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5
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Electron microscopes use electrons which have shorter wavelength that allow ---- magnification.
greater
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heart
Other team wins 10 points!
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gift
Win 25 points!
Okay!
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shark
Other team loses 20 points!
Okay!
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banana
Go to last place!
Oops!
5
×
The pupil automatically contracts in ------- light
bright
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monster
Reset all scores!
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rocket
Go to first place!
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gift
Win 15 points!
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thief
Give points!
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25
5
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A compound microscope has at least two convex lenses; an ---- lens and an ----- lens.
objective / eyepiece
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5
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What are four main photometric quantities?
luminous flux, luminous intensity, luminance and illuminance
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5
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In refracting astronomical telescope, to obtain sharp image of the distant objects the objective should have a ----- diameter.
large
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5
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Due to an eyeball is too short or due to the eye - lens cannot be sufficiently convex can be caused
farsightedness or hyperopia
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5
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In normal adjustment, the final image is at ----
infinity
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5
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Which lenses use in electron microscopes?
electrostatic or electromagnetic
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5
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Sign convention , the heights below the principal axis are _____
negative or minus
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