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A student uses a lens of focal length 40 centimeter. What is its power What type of lens is it?1 point2.5D, convex2.5D, concave-2.5D, convex-2.5D, concave​

Answer»

EXPLANATION:

FOCAL length=40cm

=40/100

=0.4m

p=1/f

=1/0.4

5/2



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