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Can the optical length between two point...

Can the optical length between two points even be less than the geometrical path between these points?

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PHYSICS GALAXY - ASHISH ARORA-WAVE OPTICS-Discussion Question
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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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  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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