Question

a converging mirror forms a real image of height 4cm of an object of height 1cm placed 20 cm away from the mirror: calculate the image distance and the focal length​

Answer 1

Answer:v=80cm & f=-80/3cm

Explanation:conversing mirror means concave mirror

Here, height of object,h=1cm

height of image,h'=4cm

Distance of object from

mirrorr,u=20cm

From the relation,-v/u=h'/h we can found

V=80cm,which is the distance of

image from the mirror

Now using the mirror formula,1/f=1/v+1/u

We can found f=uv/u+v

=>f=(-20)*80/(-20)+80

=>f=-80/3cm