friends plz help...ans is 15 D
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one lens has focal length(f1) = 10cm
since, power=1/focal length (in metre)
= P1= 1/10/100 (SINCE 1m=100cm)
= 100/10
=10D -(1)
other lens has focal length (f2)=20cm
=P2=1/20/100
= 100/20
= 5D -(2)
adding (1) and (2)
P1 + P2 = (10+5) D
= 15 D
Thus power of combination is 15D
Anonymous:
gud answer
thanks
most welcome
yo
u r in which class bro
class 10!
hows ur boards prep going on
alright wbu?
Im in 12
ooh
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