Question

A convex mirror with a focal length 20 cm creates a virtual image 10cm away from the mirror. What is the position of the object?

Answer 1

`20` cm

Step-by-step explanation:

`d_(o)` = distance of the object = ?

`f` = focal length of the convex mirror = - 20 cm

`d_(i)` = distance of the image = - 10 cm

Using the lens equation

`(1)/(d_(o)) + (1)/(d_(i)) = (1)/(f)`

`(1)/(d_(o)) + (- 1)/(10) = (- 1)/(20)`

`d_(o) = 20` cm