Question

A concave mirror produces 4 times magnified real imahe of an object placed 12cm in front of it.find its focal length?​

Answer 1

Answer:

magnification= 4

we know that,

magnification of mirror= -v/u

and u= 12cm

4=-v/12

v=-48 cm

now,

mirror formula=1/u+1/v=1/f

1/12+-1/48=1/f

3/48=1/f

1/f = 1/16

f= 16cm

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Answer 2

Answer:

m=--v/u

-4= -v/12

-48=-v

48=v

1/f=1/v+1/u

1/f=1/48+1/12

1/f=1/48+4/48

1/f=5/48

f=48/5

f=9.6cm

Explanation: