Question

if F=-10cm u=-30cm then v=____​

Answer 1

Answer:

Given, F = -10

U = -30

Find - V

we know that

1/F =1 /v + 1/u

** 1/v = 1 /f - 1/u

1/v= 1/-10 - (1/-30)

1/v= 1/-10 + 1/30

1/v= -3 + 1/ 30

1/v= -2/30

1/v=-1/15

***v =-15

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Answer 2

Answer:

1/f = I/v +1u

1/v= 1/u -1/f

1/-30 - 1/-10

By lcm

1/-30 - 3/-30

-2/-30. (minus-minus gets cancelled)

1/v =1/15

**v= 15cm

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