A dentist obtains a linear magnification of 4 of a hole i...
A dentist obtains a linear magnification of 4 of a hole in a tooth by placing a concave mirror at a distance, of 2.0cm from the tooth. The radius of Curvature of the mirror is
5.3cm
3.2cm
2.7cm
1.6cm
Correct answer is B
v = 4u, if u = 2cm, v = 8cm
F = uvu+v
= 2×82+8
= 1.6cm
r = 2F
= 2 x 1.6
= 3.2cm