Answer: The angular magnification M = 2.1
Explanation:
If the jeweler holds the diamond at the focal point of the magnifying glass, its image will be produced infinitely far away.
This gives an angular magnification of M = N/f
Since the diamond is held 5.68 cm from the magnifying glass,
Then, M = (N - 5.68)/f
Where N = 22.0 cm and f = 7.7 cm
M = (22 - 5.68)/7.7
M = 2.1