Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 531
y one time? 4. Look at the reflected image of an electric-light filament in apiece of red glass. Why are there two images, one red and one white ? 5. Show by a diagram and explanation what is meant by critical angle. 6. The vertical diameter of the sun appears noticeably less than itshorizontal… … FiG. 485. To an eye under water all exter-nal objects appear to lie within a cone whoseangle is 97° Fig. 480. Prismglass 8. Fig. 486 represents a section of a plate of prism glass. Explain whyglass of this sort is so much more efficient than ordinary window glass inilluminating the rears of dark…
Physics
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