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

What is the magnification of the lens of the projection apparatus if the height of the object on the slide is 2 cm and the height of its image is 80 cm?

The magnification of the lens of the projection apparatus is the ratio of the height of the image of an object 80 cm to the height of the object on a slide 2 cm: 80/2 = 40.

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