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Can the optical length between two point...

Can the optical length between two points everbeless than the geometrical path between these points?

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PHYSICS GALAXY - ASHISH ARORA-GEOMETRICAL OPTICS-Discussion Question
  1. If a single lens isused to form an image, it is better to use a lens o...

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

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  3. Can the optical length between two points everbeless than the geometri...

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

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

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

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

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

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

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

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

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

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

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  14. Is it possible to photograph a virtual image?

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

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

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

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

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

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

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