Q49 of 117 Page 10

What is centre of curvature?

A lens has two centers of curvature. These are the centers of the two spherical surfaces which combine to form a lens.

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47 Define power of a lens. For what type of lens is it positive? 48 Distinguish between supplementary and complementary colours. What is composite colour? 50 Define focus of a convex lens. Draw a ray diagram showing the focus. 51 What is a simple microscope?