Wednesday, 27 September 2017

IDENTIFICATION OF CONVEX AND CONCAVE LENSES

1-)  By Touching : The convex lens is thicker at the centre relative to its edges, while the concave lens is thinner at the centre than its edges. 

2-) By Image Formation : On viewing the distant objects by convex lenses the image is seen as inverted and diminished. In case of concave lenses, the images is erect  and diminished. 

On viewing the near object, e.g., printed matter in a book, it looks lager by convex lenses whereas the same appears smaller by concave lenses.

In case of a rectangular glass plate, unlike lenses, the near and far objects appear the same as they are.


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