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Chapter 23: Q40 P (page 991)
If a diver who is underwater shines a flashlight upward toward the surface, at an angle of from the normal, at what angle does the light emerge from the water? The indices of refraction are: water, ; air,
The angle at which the light emerges from the water is .
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A point source of green light is placed on the axis of a thin converging lens, 7cm to the left of the lens. The lens has a focal length of 10cm. Where is the location of the image of the source? Is it a real or a virtual image? If you placed a sheet of paper at the location of the image, what would you see on the paper.
At dawn, with the Sun just rising in the east, you facethe Sun and bend your head back to look straight up, and youexamine the blue sky light with a Polaroid庐 filter. Why is the lightpolarized? What is the direction of the electric field, east鈥攚est ornorth鈥攕outh? Explain carefully
A positive charge coasts upward at a constant velocity for a long time. Then at (Figure 23.120) a force acts downward on it for . After this force stops acting, the charge coasts upward at a smaller constant speed for 1 ns; then a force acts upward for and it resumes its original speed. The new position reached at is much less than a millimeter from the original position.
You stand at location A , to the right of the charge (Figure 23.120), with instruments for measuring electric and magnetic fields. What will you observe due to the motion of the positive charge, at what times? You do not need to calculate the magnitudes of the electric and magnetic fields, but you do need to specify their directions, and the times when these fields are observed.
A point source of green light is placed on the axis of a thin converging lens, 15cm to the left of the lens. The lens has a focal length of 10cm. Where is the location of the image of the source? Is it a real or a virtual image? If you placed a sheet of paper at the location of the image, what would you see on the paper?
The wavelength of red light is about . What are the frequency and period of this radiation?
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