Question

A dentist is examining a dental filling in a patient's tooth. The diameter of the filling is 2.9 mm, and the dentist's near point is 23.0 cm. To get a better look at the filling, the dentist dons safety goggles fitted with magnifying glasses (f = 8.6 cm).Find the greatest possible angular size (in radians) of the patient's filling when viewed by the dentist, both (a) without and (b) with the magnifying glasses. To 3 significant figures

Answer 1

solution (a) The Angular size of the filling without the Magnifying glass es l=ho 2.9 mm 23.cm 2.9 mm loocm lomm 2 3 lm ů 0.01 2 6 rad 6 The Angular size with the lens Equals es= (6 ++). 123 cm +1 +) (0.0126) 8.6cm 0 -0.046 rad