Question

A dental mirror is an example of a concave mirror. If a dental mirror with radius of curvature 10 cm is 1 cm away from
a 7 mm tooth, a) how long is the tooth’s image seen by the dentist? b) How far is the image from the mirror?

Answer 1

Answer:

radius (r)=10cm

focal length (f)=r÷2=10÷2=5cm

by using mirror formula,

(1/u)+(1/v)=(1/f)

dist of object infront of Mirror(u)=1cm

dist of image from mirror(v)

put u and f in the equation,

v will give u answer of (b)

for answer (a),

height of image seen=height of object ×(v/u)

=7 mm ×(v/1)

=.......mm