+956 a paleontologist uses a magnifying glass to look at a T-Rex skull. IF the lens has a focal length of 12 cm and she is holding it 9 cm away from the skull
a) Where is the image?
b) What is its magnification?
c) How large would the image of a 5 mm diameter crack in the skull be?
+37146 Recall that 1/f = 1/do + 1/di
So:
1/12 = 1/9 + 1/di
di = -36 cm Which means it is a virtual image on the same side as the object 36 cm from the lens
B: M= -di/do = - (-36)/9 = 4
C. magnification is 4 so 4 x 5 mm = 20mm dia
