Man's physical universe

xanabras

LIGHT MAY BE REFLECTED AND REFRACTED 441

6. What causes the stars to twinkle?

7. Explain the desert mirage.

8. Explain the hot-pavement mirage.

9. Why is it that one can see the sun rise in the morning before it has really

risen above the horizon?

10. What are the advantages of sealed-beam headlights?

11. Explain how traffic and driving lights are obtained in modern two-filament

headlights.

12. Explain how glass can be rendered invisible.

13. Point out some of the applications of rendering glass invisible by the use of

thin films.

14. Why is one likely to be deceived as to the depth of a pool of clear water?

15. How can one judge how far ahead a car is at night?

16. Define the terms: transparent, translucent, and opaque.

17. Differentiate between refraction and diffraction.

18. Differentiate between scattering and diffraction.

19. What evidence can you give to prove that light travels in a straight line?

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