Question

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

Answer 1

in case 1st :-

m = -v/u

so v = 10cm

so by lense formula f = 1.25cm

while f will be same so

now calculate for u by m = f/f-u

put the value and get ur answer

u = -1.50cm