Question

If angle of incidence increases angle of deviation decreases,but aftera certain value of angle of incident,the angle of deviation increases.What is that specific value of angle of incident called?Does these angles same for light of all colours?

Answer 1

Screen is just an device or an instrument where the image formed is to be observed. If the screen is removed, the lens will continue to form the image on its focus. Thus, on removing the screen and on looking through the lens in the direction of the object the image of the distant tree is inverted and formed at the focus .

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