Question

an object of size 5cm placed 10cm away from a concave mirror of focal length 15cm find image distance image size and nature of image​

Answer 1

given:u =10cm

f= 15cm

v =?

we have,1/f=1/v-1/u

1/f+1/u=1/v

1/15+1/10=1/v

2+3/30=1/v

5/30=1/v

1/6=1/v

v=6

therefore,v=6

size of the image = hi/ho=v/u

= hi/5=6/10

= hi/5=3/5

= 5hi=15

= hi=15/5

= hi=3

hence,the size of the image is 3cm.And the nature of the image is virtual and erect.