Question

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?​

Answer 1

Answer:

is in the attachment........

Dentists use concave mirror......

hope this help u....

Answer 2

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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