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Why does the moon, purely white during t...

Why does the moon, purely white during the day, have a yellowish hue after sunset ?

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Why does the moon change its shape daily?

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Why does the Sun appear reddish at the time of sunset ?

(a) Give reasons for the following: (i) The sky appears to be blue during day time to a person on earth. (ii) The sky near the horizon appears to have a reddish hue at the time of sunset and sunrise. (iii) The sky appears dark instead of blue to an astronaut. (iv) The stars appear to twinkle. (v) The planets do not twinkle.

Why does the Moon seem to change shape from week to week?

PHYSICS GALAXY - ASHISH ARORA-GEOMETRICAL OPTICS-Discussion Question
  1. Can the optical length between two points everbeless than the geometri...

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  2. Can two lenses of the same material produce achromatism when placed in...

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  3. Why is the aperture of objective lens of a telescope taken large ?

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  4. A iiver inside the sea observes a ship on the water surface. Does he f...

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  5. Why does the moon, purely white during the day, have a yellowish hue a...

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  6. How focal length of a spherical mirror changes when placed in differen...

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  7. An air bubble inside water broadly behaves as a concave lens. Is the t...

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  8. Why does an aeroplane flying at a great altitude not cast a shadow on ...

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  9. The magnifying power of a telescope in normal adjustment is greater th...

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  10. When sun rays pass through a small hole in the foliage at the top of a...

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  11. If a mirror reverses right and left, why doesn't it reverse up and dow...

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  12. Is it possible to photograph a virtual image?

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  13. Is it possible for a given lens to act as a converging lens in one med...

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  14. A camera lens is marked f//1.8. What is the meaning of this mark?

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  15. Some motor cars have additional yellow headlights. Why?

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  16. Why are lenses often coated with thin films of transparent material ?

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  17. If these are scratches on the lens of a camera, they do not appear on ...

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  18. The sun seems to rise before it actually rises and it seems to set lon...

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  19. Does the focal length ofa lens depend on the medium in which the lens ...

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  20. Explain why the use of goggles enables an underwater swimmer to see cl...

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