Question

face of man is 20cm away from shaving mirror. if the focal length of the shaving mirror is 80cm then calculate the distance of image from the mirror and its magnification

Answer 1

which type of mirror he use

Answer 2

Explanation:

F= -80 cm (concave mirror)

v=?

m=?

u= -20cm

1/v + 1/u = 1/f

1/v = 1/f -1/u

1/v = 1 /-80 - 1/-20

1/80 + 1/20

-1+4/80 = 3/80

v= 80/3 = 26.27cm

magnification

m= -v/u

m= -26.67/20

m= 1.3335