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 = \(\frac{uv}{u + v}\)
= \(\frac{2 \times 8}{2 + 8}\)
= 1.6cm
r = 2F
= 2 x 1.6
= 3.2cm
The phenomenon of radioactivity was first discovered by ...
A direct current of 5A flow through a 0.2H inductor. Calculate the energy stored in the inductor...
When an atom loses or gains a charge, it becomes ...
The reason for having a large number of turns in the coil of a moving coil galvanometer is to--...