Question

An object 4cm high is placed at a distance of 50cm from a concave mirror of focal length 30cm . find the position, nature and size of the image formad by the mierror.

Answer 1

ho = 4cm
u = -50cm
f = -30cm
a/c mirror's formula
1/v+1/u=1/f
1/v=1/f-1/u
1/v=-1/30 - (-1/50)
1/v = 1/50 - 1/30
1/v = 6-10/300
1/v = -4/300
v = -300/4
v = -75 cm
hi/ho = -v/u
hi = -(-75)/-50*4
hi = -3/2*4
hi = -6 cm