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Lenses - Practice Set 3, Q3
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Matviy_5556
#1 Posted : Tuesday, June 09, 2020 11:43:58 AM
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With myopia, a person cannot see things far away because the eyes focus TOO MUCH light making the focal point in front of the retina. Shouldn't corrective lenses then increase the focal length so that the image is focused further behind and ON the retina?

Is focusing TOO much light, and therefore creating an image in front of the retina, not synonymous with too much power? This is why I thought a decrease in power is needed to correct for myopia, so the focal length can be increased. This is contrary to correct answer choice D.
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INSTR_Amira_87
#2 Posted : Wednesday, June 10, 2020 3:03:04 PM
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Hi! I'm not sure which question you are referring to, but your initial reasoning is correct in that myopic eyes focus light in front of the retina. However, power is relative to a lens: a powerful converging lens will focus light closer to the lens and a powerful diverging lens will focus light far away from the lens. Someone who is *very* myopic will need a more powerful diverging lens to correct this (ex: -3 diopters vs -6 diopters). Hope this clears things up!
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