Question

when an object is placed at a distance of 50 cm from a concave spherical mirror the magnification produced is -1/2 where should the object be placed to get a magnification of minus 1/5 ​

Answer 1

Answer:

u=-100cm

Explanation:

m=-1/2

-1/2=-v/u

-1/2=-v/-50

v=-25

for focal length

1/f=1/v+1/u

=-1/50+(1/-25)

-1/50-1/25

f= -3/50

case 2

m=-1/5

-1/5= -v/u

U = 5v

1/f =1/v +1/u

put the value of f

-3/50 = 1/v + 1/5v

-15v = 300

V = -20

For U

u = 5v

put the value of v

u = 5(-20)

u = -100cm