What is the magnification of the lens of the projection apparatus if the height of the object on the transparency is 2 cm

What is the magnification of the lens of the projection apparatus if the height of the object on the transparency is 2 cm and on the screen is 50 cm? What is the focal length and optical power of such a lens equal?

decision
G = 50/2 = 25;
F = 0.002 m;
D = 500 diopters
The answer is 500 diopters

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.