Answer the following Question
(a) What is meant by 'power of a lens
(b) State and define the SI unit of power of a lens.
(c) A convex lens of focal length 25 cm and a concave lens of focal length 10 em are placed
in close contact with each other. Calculate the lens power of this combination.
Answers
Answered by
1
Answer:
a) the magnification of the lens is called power
b) doiptre (in meter units)
D=1/f
Answered by
1
Answer:
(a) The power of lens is defined as the reciprical of focal length.The degree of convergence or divergence of light rays is termed as power of lens.
(b) SI unit of lens is dioptre its sign is D.
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