A dentist mirror has a radius of the curvature of 3cm . how far musy it beplaced from it be placed from a small dental cavity to give a virtual image of the cavity thats is magnified five times?
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Answer:
is in the attachment........
Dentists use concave mirror......
hope this help u....
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R = - 3 cm (Concave mirror)
m = 5 (virtual image)
f = R/2 = - (3/2) = -1.5 cm
and
m = 5 = - (v/u) ⇒ v = - 5 u
We have,
1/v + 1/u = 1/f
⇒ 1/(-5u) + 1/u = 1/(-1.5)
⇒ 4/5u = - (1/1.5)
⇒ u = - (4 × 1.5)/5 = -1.2 cm
The mirror should be placed 1.2 cm away from dental cavity.
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