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Chapter 25: Q8PE (page 929)
In what substance in Table 25.1is the speed of light 2.290 x 108 m/s?
As for , Substance is ice at.
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What is the focal length of reading glasses found on the rack in a pharmacy?
Light traveling from water to a gemstone strikes the surface at an angle of 80.0º and has an angle of refraction of 15.2º.
(a) What is the speed of light in the gemstone?
(b) What is unreasonable about this result?
(c) Which assumptions are unreasonable or inconsistent?
A ring with a colorless gemstone is dropped into water. The gemstone becomes invisible when submerged. Can it be a diamond? Explain.
An object \(1.50{\rm{ }}cm\)high is held \(3.00{\rm{ }}cm\)from a person’s cornea, and its reflected image is measured to be \(0.167{\rm{ }}cm\)high.
(a) What is the magnification?
(b) Where is the image?
(c) Find the radius of curvature of the convex mirror formed by the cornea. (Note that this technique is used by optometrists to measure the curvature of the cornea for contact lens fitting. The instrument used is called a keratometer, or curve measurer.)
A thin lens has two focal points, one on either side, at equal distances from its center, and should behave the same for light entering from either side. Look through your eyeglasses (or those of a friend) backward and forward and comment on whether they are thin lenses.
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