Question

19. A concave mirror has a focal length of 4 cm and an object 2 cm tall is placed 9 cm away from it. Find the
nature, position and size of the image .​

Answer 1

Answer:

u=−15cm

f=−10cm

h=1cm

From mirror formula

f1=u1+v1

v1=f1−u1

v1=−101−−151

v=−30cm

The image is formed at a distance 30cm on the left side of the mirror from the pole.

m=hh′=u−v

h′=−1×−15−30

h=−2cm

The image size is 2cm and it is real and inverted.