1.

If the image formed by a lens for all positions of an object placed in frontof it is always erect and diminished, what is the nature of this lens?Draw a ray diagram to justify your answer. If the numerical value of thepower of this lens is 10 D, what is its focal length in the Cartesiansystem?

Answer»

Power of a lens is given by the relation...

P = 1/f(in meter)

P=10D

F=1/p

=1/10

=0.1m

Or. -10cm,(as lens in concave lens. )

Hope it helps you



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