A dentist obtains a linear magnification of 4 of a hole in a tooth by...

JAMB 1986

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

A. 5.3cm
B. 3.2cm
C. 2.7cm
D. 1.6cm

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Correct Answer: Option B

Explanation

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

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A dentist obtains a linear magnification of 4 of a hole in a tooth by...

Correct Answer: Option B

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