Question

the power of a lens is -2.5D.which type of lens is this?Also find the power of focal lens.


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Answer 1

Answer:

concave lens, 40cm

Explanation:

As the power is negative, the lens is a concave lens..

Power=1/f(in metres)

∴ f=1/power

   =1/2.5

   = 0.4m

thus, f= 0.4m or 40cm

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