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Chapter 25: Q21CQ (page 928)
Is it necessary to project a real image onto a screen for it to exist?
No, even without projection, an actual image exists.
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Calculate the index of refraction for a medium in which the speed of light is , and identify the most likely substance based on Table 25.1.
You can determine the index of refraction of a substance by determining its critical angle.
(a) What is the index of refraction of a substance that has a critical angle of 68.4潞 when submerged in water? What is the substance, based on Table 25.1?
(b) What would the critical angle be for this substance in air?
(a) Calculate the focal length of the mirror formed by the shiny back of a spoon that has a \(3\;cm\)radius of curvature.(b) What is its power in diopters?
A parallel beam of light containing orange (\(610{\rm{ }}nm\)) and violet (\(410{\rm{ }}nm\)) wavelengths goes from fused quartz to water, striking the surface between them at a\({60.0^ \circ }\)incident angle. What is the angle between the two colours in water?
Using the law of reflection, explain how powder takes the shine off of a person鈥檚 nose. What is the name of the optical effect?
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