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5
×
Sign convention , the heights below the principal axis are _____
negative or minus
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×
baam
Lose 25 points!
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gold
Win 50 points!
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fairy
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25
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thief
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25
5
×
A magnifying glass that has a bi-convex lens with a short focal length is a
simple microscope
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×
trap
No points!
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seesaw
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gift
Win 10 points!
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baam
Lose 15 points!
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5
×
A compound microscope has at least two convex lenses; an ---- lens and an ----- lens.
objective / eyepiece
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5
×
In astronomical telescope, a concave mirror used as the -------- instead of a convex lens.
objective
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banana
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fairy
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25
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fairy
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25
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banana
Go to last place!
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5
×
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
×
In normal adjustment, the separation of lenses ; L =
v o + f e
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5
×
luminous flux is measured in --------
lumen (lm)
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5
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Formula of magnifying power of compound microscope is
MP = vo / uo ( 1 + D/ f e )
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5
×
What are four main photometric quantities?
luminous flux, luminous intensity, luminance and illuminance
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5
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In astronomical telescope, the final image formed by the eyepiece is -------, ----- than the first image.
virtual / larger
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5
×
For normal person, the least distance of distinct vision is
25 cm
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5
×
Which lenses use in electron microscopes?
electrostatic or electromagnetic
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×
monster
Reset all scores!
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gift
Win 25 points!
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fairy
Take points!
5
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15
20
25
×
banana
Go to last place!
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