1) define 1 dioptre of power of lens ?
2) _____ medium has highest optical density and ______ medium has lowest optical density .
3) Define the principal focus of a concave mirror.
4) Name a mirror that can give an erect and enlarged image of an object.
5) Why do we prefer a convex mirror as a rare view mirror in vehicles ?
6) The refractive index of diamond is 2.42 . what is the meaning of this statement ?
7) An object 5cm in length is held 25cm away from a converging lens of focal length 10cm . draw the ray diagram and find the position,size and the nature of the image formed.
8) A concave lens of focal length 15cm forms an image 10 cm from the lens . how far is the object placed from the lens ? Draw the ray diagram.
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Why is cell called structural and functional unit of life.?
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