Answer:
600
Step-by-step explanation:
The magnification of anything is defined as the enlargement of the apparent size of the object.
The total magnifiation of the lens if given by :
Power of objective X power of the eye piece.
For the given question,
Magnification proivded by objective = 40X
Magnification provided by eyepiece = 15X
Total magnification = 15 X 40 = 600.