Final answer:
In mammography, the routinely used focal spot sizes are 0.3 mm for detailed imaging and 1 mm for general imaging. For this question, the correct focal spot size is 1 mm. Additionally, when using a 15.0 cm focal length magnifying glass, the examination of a mole can yield information on image location, size, and magnification.
Step-by-step explanation:
Understanding Mammography Focal Spot Size
In mammography, the typical focal spot size used for routine screenings is either 0.3 mm or 1 mm. The smaller spot size (0.3 mm) is often used for detailed imaging or magnification views, whereas the 1 mm spot size is utilized for general imaging. For the purposes of this question, given the options, the correct focal spot size for routine work would be C. 1 mm.
Magnifying Glass Examination
When a doctor examines a mole using a magnifying glass with a 15.0 cm focal length, and the glass is held 13.5 cm from the mole, the specifics of the visualization can be calculated using the lens formula. By solving for the image distance and magnification, we can determine the virtual image location, its size, and magnification:
- (a) The image is located at infinity since the object distance is slightly less than the focal length, creating a virtual image.
- (b) The magnification of the image is calculated as the negative ratio of the image distance to the object distance.
- (c) The size of the image can be found by multiplying the actual size by the magnification factor.