After an eye examination, you put some eye drops on your sensitive eyes. The cornea (the front
Question:
After an eye examination, you put some eye drops on your sensitive eyes. The cornea (the front part of the eye) has an index of refraction of 1.38, while the eye drops have a refractive index of 1.45. After you put in the drops, your friends notice that your eyes look red, because red light of wavelength 600 nm has been reinforced in the reflected light.
(a) What is the minimum thickness of the film of eye drops on your cornea?
(b) Will any other wavelengths of visible light be reinforced in the reflected light? Will any be cancelled?
(c) Suppose you had contact lenses, so that the eyedrops went on them instead of on your corneas. If the refractive index of the lens material is 1.50 and the layer of eye drops has the same thickness as in part (a), what wavelengths of visible light will be reinforced? What wavelengths will be cancelled?
Step by Step Answer:
Identify and Set Up Consider reflection from either side of the film a At the front of the film ligh...View the full answer
University Physics with Modern Physics
ISBN: 978-0321696861
13th edition
Authors: Hugh D. Young, Roger A. Freedman, A. Lewis Ford
Related Video
Using a few basic physics principles, you can impress your friends with a trick that makes a bottle disappear. For this experiment, you will need a mini plastic bottle, glycerin, a glass, and a funnel. First, open the bottle and pour some glycerin into it, then close the bottle tightly. Next, pour some water into the glass using a funnel. Place the mini bottle into the glass of water and it will look normal. This is because light travels through air faster than it travels through the glass and water, allowing our eyes to see the bottle inside the glass. However, when you fill the mini bottle with more glycerin, and pour glycerin into the glass, then put the glycerin filled bottle into the glass with glycerin in it. Half of the bottle that is submerged in the glycerin will become invisible as the light travels through glass and glycerin at the same speed, thus it does not bend and no refraction takes place, making the bottle invisible. This happens because both glass and glycerin have almost the same refractive index, which causes the speed of light to be the same in both mediums, causing no bending of light and making the bottle disappear.
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