Discussion on Light


 

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Posted on: 08:44:37 PM on October 23, 2017
why light when passes through optical centre of lens still it follows the same path


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Posted on: 02:29:38 PM on October 26, 2017
Look at the lens as a slab of finite thickness. In a small vicinity around its center we may consider its opposing surfaces as parallel to each other. A ray incident on this area, at any angle, will be refracted twice at parallel interfaces. Therefore it will emerge on the other side of the lens on a direction slightly displaced, but parallel to the incident one. Since the parallel displacement is tiny as long as the lens is not too thick, it looks like the ray passes through the center undeviated



Posted on: 02:33:24 PM on October 26, 2017
But as the lens gets thicker and thicker the deviation will become larger.





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