Question 161: Ray Optics

Question

A concave mirror for face viewing has focal
length of 0.4 m. The distance at which you hold
the mirror from your face in order to see your
image upright with a magnification of 5 is :

Accepted Answer

$$m = {f \over {f - u}}$$
$$5 = {{ - 40} \over { - 40 - u}};\,u =  - 32cm$$

Answer

0.24 m

Answer

0.32 m

Answer

1.60 m

Answer

0.16 m

Ray Optics

A concave mirror for face viewing has focal length of 0.4 m. The distance at which you hold the mirror from your face in order to see your image upright with a magnification of 5 is :

Choose the correct answer: