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What is a simple microscope?

Simple microscope is an instrument which is used to magnify small objects. It is used by a convex lens for which the object placed within the focus, then the image obtained is highly magnified.

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49 What is centre of curvature? 50 Define focus of a convex lens. Draw a ray diagram showing the focus. 52 Light of wavelength 500nm in air enters a glass plate of refractive index 1.5. find its wavelength in glass. 53 What is the consequence of making angle of incidence of light, at an interface, greater than the critical angle?