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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
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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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baam
Lose 20 points!
Oops!
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seesaw
Swap points!
Okay!
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rocket
Go to first place!
Okay!
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banana
Go to last place!
Oops!
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lifesaver
Give 20 points!
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magnet
Take 15 points!
Okay!
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fairy
Take points!
5
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20
25
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lifesaver
Give 20 points!
Oops!
5
×
The light sensitive area of the cells, at the back of the eye is ----
the retina
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banana
Go to last place!
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gold
Win 50 points!
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fairy
Take points!
5
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15
20
25
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thief
Give points!
5
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15
20
25
5
×
The optical instrument can be used for viewing distant objects is called a -----
telescope
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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
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What are widely used as terrestrial telescopes?
binoculars
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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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5
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In compound microscope, the objective lens produces an image which is -----, --- and ------ the size of the object.
real, inverted , larger than
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5
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Lenses marker's formula
1/f = (n - 1) [ 1/ R1 - 1/R2 ]
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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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the front portion of the eye is covered by a tough, transparent membrane
cornea
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5
×
For normal person, the least distance of distinct vision is
25 cm
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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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