Question

A concave mirror has a radius of curvature of 20 cm. For what the two object distances will the image have twice the height of the object​

Answer 1

Answer:

Object distance = 10 cm

Explanation:

Given size of image is twice that of object.

hi /ho = - v /u

hi = 2 ho

- v / u = 1 /2

-2v = u

1 /v + 1 /u = 1 /f

1 /v - 1 /2v = 1 /10

1 /2v = 1 /10

v = 5 cm

u = 10 cm