express the power of concave lrnse of focal length 20 cm
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Power = 1 / Focal Length
P = 1 / 20 = 0.05
anirudh9127:
you are wrong
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p=1/f (in metres )
so,
f= 20cm in metres =20/100 =0.2
p=1/f
=1/0.2
= 5(dioptres)
so,
f= 20cm in metres =20/100 =0.2
p=1/f
=1/0.2
= 5(dioptres)
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