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Answer:24 - A clear cloudless day -time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.
23 - First law of refraction states that the incident ray, the refracted ray and the normal to the interface all lie in the same plane. Second law of refraction states that for two given media, the ratio sini sinr = constant s i n i s i n r = c o n s t a n t, where i i is the angle of incidence and r r is the angle of refraction
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