A student uses a lens of focal length 40 centimeter. What is its power What type of lens is it?
1 point
2.5D, convex
2.5D, concave
-2.5D, convex
-2.5D, concave
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Explanation:
focal length=40cm
=40/100
=0.4m
p=1/f
=1/0.4
5/2
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