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Chapter 35: Q. 12 (page 1017)
Ellen wears eyeglasses with the prescription.
a. What eye condition does Ellen have?
b. What is her far point without the glasses?
a. Ellen has Myopia.
b. The far point without the glasses is.
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An astronomer is trying to observe two distant stars. The stars are marginally resolved when she looks at them through a filter that passes green light with a wavelength near 550 nm. Which of the following actions would improve the resolution? Assume that the resolution is not limited by the atmosphere.
A. Changing the filter to a different wavelength. If so, should she use a shorter or a longer wavelength?
B. Using a telescope with an objective lens of the same diameter but a different focal length. If so, should she select a shorter or a longer focal length?
C. Using a telescope with an objective lens of the same focal length but a different diameter. If so, should she select a larger or a smaller diameter?
D. Using an eyepiece with a different magnification. If so, should she select an eyepiece with more or less magnification?
A narrow beam of white light is incident on a sheet of quartz. The beam disperses in the quartz, with red light traveling at an angle of with respect to the normal and violet light traveling at . The index of refraction of quartz for red light is . What is the index of refraction of quartz for violet light?
A microscope with a tube length of achieves a total magnification of with a objectives and a eye piece. The microscope is focused for viewing with a related eye. how far is the sample from the objective lens?
In figure , parallel rays from the left are focused to a point at two locations on the optical axis. find the position of each location, giving your answer as a distance left or right of the lens.
Two converging lenses with focal lengths of 40 cm and 20 cm are 10 cm apart. A 2.0-cm-tall object is 15 cm in front of the 40-cm-focal-length lens. a). Use ray tracing to find the position and height of the image. Do this accurately using a ruler or paper with a grid, then make measurements on your diagram.
b). Calculate the image position and height. Compare with your ray-tracing answers in part a.
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