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PH 223 24.1-3

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by

Richard Datwyler

on 7 October 2016

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Transcript of PH 223 24.1-3

A converging lens with a focal length of 40 cm and a diverging lens with a focal length of -40 cm are 160 cm apart. A 2.0 cm object is 60 cm in front of the converging lens.
Ray tracing
find position and height of image.
A 12 - mm focal length lens has a 4.0 mm diameter aperture. What is the aperture diameter of an 18 - mm focal length lens with the same f-number?
A camera takes properly exposed photos at f/5.6 and 1/125 s. What shutter speed should be used if the lens is changed to f/4.0
Ray has contact lenses with the prescription + 2.0 D.
a. What eye condition does he have?
b. What is his near point without the lenses?
Ellen wears eyeglasses with the prescription -1.0 D.
a. What eye condition does she have?
b. What is her far point?
"how does laser eye corrective surgery alter the eye and make it function as its supposed to?"
"I need some help with ray-tracing double lenses."
"So when the eye doctor is testing your eyes, is he just testing if your ciliary muscles are capable of contracting/relaxing enough to see objects at certain distances? I just think section 3 about the human eye is fascinating. "
"I've heard of a trick where people with bad vision (near sighted, I think) can look through a small hole in a piece of paper and this will help them see further. Does this work? If so, how?"
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