What would happen if the cinema screen was completely smooth? Answer: If the movie screen was completely smooth, the light would reflect regularly on the screen. As a result, the audience could only see the picture from a certain direction in the hall and were dazzled by the reflected light. The viewers on the other […]
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Why are cinema screens made white? Answer: As the cinema screen is white, it does not absorb the incident light but reflects almost the entire part. So the picture looks brighter on the white screen. Also, because the white screen reflects all colours of light, the colour of the image does not change. Hence, the
Why are cinema screens made rough? Answer: As the cinema screen is rough, defused reflection occurs by the incident light on the screen. As a result, the reflected rays spread around the hall, i.e. reaching the eyes of every spectator. That is why the audience can see the picture from any place in the hall.
Why are cinema screens made white and rough? Answer: As the cinema screen is rough, defused reflection occurs by the incident light on the screen. As a result, the reflected rays spread around the hall, i.e. reaching the eyes of every spectator. That is why the audience can see the picture from any place in
Why do stars twinkle and planets do not? Answer: The density of different layers of the atmosphere is constantly changing. As density changes, the refractive index of the medium also changes. Stars are far away from Earth and the rays coming from the stars pass through different density layers of the atmosphere before reaching the
Why does the sooted iron ball shine when immersed in water? Answer: Dipping a sooted iron ball in water makes the ball shine. Because the ball is smeared with soot, a thin layer of air adheres to the ball. Light rays pass from a denser medium to a lighter medium as they pass from the
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Why does a diamond sparkle? Answer: Diamonds shine because of the full reflection of light. Because the refractive index of a diamond is very high, the critical angle of a diamond relative to air is low. The value of this critical angle is 24.5°. The surfaces of the diamond are cut in such a way
Why does oily paper appear slightly translucent? Answer: Normally light is scattered because the surface of the paper is rough, but part of the light is refracted because of the oil inside the oiled paper. As a result, the oiled paper appears slightly translucent.
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Clear glass powder appears opaque, but when some water is poured into the glass powder, why does it appear transparent again? Answer: Light travels easily through the glass. So the glass appears transparent. But the rough surface of powdered glass reflects scattered light, so the powdered glass appears opaque. But when water is poured into
Why does the sun appear flat during sunrise and sunset? Answer: During sunrise and sunset, the sun appears slightly tilted up and down due to the refraction of light in the atmosphere. At this time the lower edge of the sun is closer to the horizon than the upper edge. As a result, rays coming
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