Question

give the answer of question no. 3

Answer 1

Answer:

f= 20

u=30

1/f = 1/v-1/u (lens formula)

1/20= 1/v-1/30

1/v= 1/20 + 1/30

1/v=50/600

1/v=1/12

v =12

Step-by-step explanation:

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Answer 2

Answer:

and is 12.....

hope it helps