Question

how did 1-3 and -15 come? Pleaseeee answerrrrrrrrrrr ​

Answer 1

Explanation:

Given,

In case of concave mirror,

u = - 30cm

f = - 10cm

v = -(?)cm

Using Mirror formula,

1/v + 1/u = 1/f

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

v = -30/2

v = -15cm