Magnifying Mirrors
A dentist wants a small mirror that, when placed 2.2cm from a tooth, will produce a 4.5X upright image. What kind of mirror must be used and what must its radius of curvature be? m=4.5di=-4.5do
Where di,o are the image and object positions respectively.
We use the mirror equation:
- 1/f=1/do+1/di
=(1/do-1/4.5do)
=(35/45)(1/do)
=7/(9do)
f=2.8cm
r=2f=5.6cm
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