HWK45s_G11(1) - (faster), light bends away from the normal....

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HWK 45 (11th grade) (SOLUTIONS) (due 6/1/07) Read chp. 29 pgs. 454-459 Do 22, 23, 26, 27, 33 29.22: Higher frequencies tend to get sbsorbed and reemitted and this slows down their motion through a material. So, blue light refracts more (bends more) when entering another material. 29.23: Blue light (higher frequency) refracts more than the red light (lower frequency) because it is absorbed and reemitted more than the red light. As described above, this causes blue light to travel more slowly in a material. 29.26 Snell’s Law shows that the greater the angle of incidence, the greater the angle of refraction when light passes into a material. When going from a high index of refraction (slower) to a lower index of refraction
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Unformatted text preview: (faster), light bends away from the normal. If the angle of incidence is greater than a critical angle , then the angle of refraction is greater than 90 o and the ray is totally reected back into the rst material. (This is called total internal reection ). 29.27 Optical bres use the phenomenon of total internal reection to direct or pipe light along a desired path. 29.33 An echo is weaker than the original sound because part of the en-ergy in the original sound wave has been absorbed. This means less energy in the reected sound wave, so less energy per unit time is being transferred (i.e. less power, less intensity, less loudness). 1...
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This note was uploaded on 10/19/2011 for the course PHY 2020 taught by Professor Staff during the Spring '08 term at University of Florida.

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