Question

a short linear object of length 1 mm is placed along the principal axis of a concave mirror of focal length 10 cm find the length of image obtained if the object is at distance 15 cm from the pole​

Answer 1

f =-6 cm(since concave mirror)

h2 =?

h1=1mm =o.1 cm ( object height )

u= -15cm ( image distance)

now..

1/v + 1/u =1/f

thus

1/ v =1/ f -1/ u

putting values

we get value of v

then use

h2/h1 =-v/u

we get h2

i.e the final answer