A student uses a lens of focal length 40cm
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A student uses a lens of focal length 40cm and another of -20cm. Write the nature and power of each lens.
Answered by admin @
Student A:40cm
p=1/f
p=1/0.4 (40cm=40/100m)
p=1x10/4
p=+2.5D
converging or convex lens.
Student B:f=-20cm
P=1/f
p=1/-0.2(-20cm=-20/100)
p=1x10/-2
p=-5D
diverging or concave lens.
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