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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 |
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Answer» FOCAL length=40cm =40/100 =0.4m p=1/f =1/0.4 5/2 |
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