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Why does an aeroplane flying at a great altitude not cast a shadow on the earth ?

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PHYSICS GALAXY - ASHISH ARORA-WAVE OPTICS-Discussion Question
  1. Why does an aeroplane flying at a great altitude not cast a shadow on ...

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

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

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  4. How can we see a virtual image when it cannot be obtained on a screen ...

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  5. Is is possible for a given lens to act as a converging lens in one med...

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

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

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  8. The sum seems to rise before it actually rises and it seems to set lon...

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  9. Does the focal length of a lens depend on the medium in which the lens...

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

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

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  12. Why does a column of smoke rising above the roof of houses sseem blue ...

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  13. What are primary colours ? Why are they so called ?

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  14. A beam of white lighe passing through a hollow prism gives no spectrum...

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  15. Ordinary paper becomes transparent when it is oiled. Explain why.

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

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  17. What is the best position of the eye for viewing an object through a m...

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  18. What is the function of the circular stop at the focal plane of the ob...

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

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  20. Can the optical length between two points even be less than the geomet...

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