Question

help mee fastttttttttt​

Answer 1

Answer:

Bro since power is equal to

$1 \div f \\ f \: in \: metres$

so,

18) lens R has greatest power

$1 \div (5 \div 100) \\ = 20d$

19) lens P has 5D

$1 \div (20 \div 100) \\ 100 \div 20 = 5$

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