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

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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 reflected back into the first material. (This is called total internal reflection ). 29.27 Optical fibres use the phenomenon of total internal reflection 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 reflected sound wave, so less energy per unit time is being transferred (i.e. less power, less intensity, less loudness). 1...
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