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CBSE Class 10 Answered

1. Why do light rays passing through optical centre of lens experiences no deviation?  2. Why it is harmful to look at the sun through convex lens? 
Asked by agraharianiruddha | 05 Oct, 2018, 06:14: PM
answered-by-expert Expert Answer
As shown in figure, a convex lens can be split into three parts, top and bottom parts are like prism and middle part is like a slab.
It is well known that light enters through a transparent slab will not be deviated but only gets lateral displacement.
This lateral displacement proportional to the optical path in the slab. Optical path will be very less in the considered slab part of the lens
and hence lateral displacement also negligible.
Hence light ray eneters in the optical centre region of lens passes through the lens with negligible deviation.
This analysis is true also for concave lens.
 
It is well known that parallel rays are getting focused at focal point by convex lens. Light rays coming from long distances are parallel rays.
hence sunlight will be focused at eye and will cause irrecoverable damage to eye.
Answered by Thiyagarajan K | 05 Oct, 2018, 06:53: PM

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