recap i lecture 30 - cornell universityliepe/webpage/docs/... · normal (emmetropic) eye: the image...
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© Matthias Liepe, 2012
Recap I Lecture 30
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Recap II
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Today:
•Lenses
•Optical instruments
• Interference
Constructive Destructive
wave 1
wave 2
combined
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Light from distant object O
Image I
The Eye:
• Near point: closest distance at which you can focus on an object • Far point: furthest distance at which you can focus on an object
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Normal (emmetropic) eye:
The image point of an object point at infinity is formed on the retina when the eye is relaxed.
The far point for this eye is at infinity (effectively anywhere beyond 5 m).
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Nearsighted (myopic) eye:
The image point of an object point at infinity is formed in front of the retina.
The far point of this eye is closer than infinity; the eye cannot form a clear image of any object point beyond this far point.
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Farsighted (hyperopic) eye:
The image point of an object point at infinity is formed behind the retina when the eye is relaxed.
The near point of this eye is too far away; the eye cannot form a clear image of any object point closer than this near point.
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A (pathetic) nearsighted eye has its far point at 0.20 m.
What should be the power of a contact lens such that the far point is at infinity when the eye is wearing the contact lens?
A. 0.20 m1 B. 0.20 m1 C. 5.0 m1 D. 5.0 m1 E. Not enough information.
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Optical Instruments: Simple Magnifying Glass
Without magnifying lens:
object
Near point distance
object
With magnifying lens: object just inside the focal point
F m ~ 25 cm/f
image
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Optical Instruments: Microscope
Real image
View real image with eyepiece
Virtual image
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Optical Instruments: Telescope
Real image of distant object
Virtual image
Objective Eyepiece
Distant object
Parallel rays from distant object
View real image with eyepiece
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