Question

a dentist uses a spherical mirror to produce an upright image of patients tooth which is magnified by a factor of 4.5 when placed 1.8 cm from the tooth .
(a )what type of mirror is used?
( b) what is a focal length of the mirror?​

Answer 1

Answer:

(a) concave mirror

(b)m= -v/u

v=8.1

according to mirror formula

1/f=1/v+1/u

1/f=1/8.1+1/1.8

1/f=(1-4.5)/8.1

1/f=-3.5/8.1

f=-8.1/3.5

f=-2.31