Question

pls ans to be brainlist

Answer 1

The answer is +1.25 D. Use lens formula to calculate focal length. Then you can easily calculate power.

Answer 2

Now,

U= -25cm

V= -90cm

We have 1/f=1/v-1/u

1/f=1/-90-(1/-25)

=-65/2250

f= -2250/65

f= -450/13

Now,Power =1/f

= -13/450

Hence,power is 0.0289 dioptres

Hope it helps you.

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