A student uses a lens of focal length -30 cm. What is the power and nature of this lens?
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Power of lens = 1/focal length (in metres)
Convert 30cm into metres
1cm=1/100 m
30cm = 30/100 m
Put value in formula
Power = 1/-30/100
Power = -100/30
=-10/3 Dioptre
Nature- diverging lens or concave lens
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Answer:
One student uses a lens of focal length 50cm and another of -25cm. What is the nature
of lens and its power used by each of them?
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