Question

An object 2 cm high is placed at a distance of 64 cm from a white screen. On placing a concave mirror at a distance of 32 cm from the object it is found that a distinct image of the object is formed on the screen. What is the focal length of the concave mirror and size of the image formed on the screen? Draw a ray diagram to show the formation of the image in this position of the object with respect to the mirror.

Answer 1

Answer:

Since, object-screen distance is double of object-lens separation, the object is at a distance of 2f  from the lens and the image should be of the same size of the object. 

So 2f=32⇒f=16 cm

Height of image = Height of object  =2 cm