Sunday, 2 October 2011

5.4 understanding lenses




The differences between microscope and telescope

Aspects
microscope
telescope
Type of lens
Two high powered convex lenses
A low powered convex lens and a high powered convex lens
Focal  length
F0 < f1
F0 >f1
First image
magnified
diminished
Position of final image
Near point of observer’s eye
infinity
Distance between lenses
Greater than f0+f1
Equal to f0+f1
Linear magnification , M
M = m0 X m1
M = f0 / f1
Condition of eye when using the instrumet
Ciliary muscles are at ease and the eye is relaxed
Ciliary muscles are contracted . eye is strained

SOURCES ;

SUCCESS Physics SPM (page 279)

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