Question

A compound microscope consists of two converging lenses. One of them, of smaller aperture and smaller focal length, is called objective and the other of slightly larger aperture and slightly larger focal length is called eye-piece. Both lenses are fitted in a tube with an arrangement to vary the distance between them. A tiny object is placed in front of the objective at a distance slightly greater than its focal length. The objective produces the image of the object which acts as an object for the eye-piece. The eye-piece, in turn, produces the final magnified image.

A compound microscope consists of an objective of 10X and an eye-piece of 20X. The magnification due to the microscope would be:

Options

• 2

• 10

• 30

• 200

Answer 1

200

Explanation:

10X lens and 20X lens mean their magnifications are 10 and 20 respectively.

So, the magnification of the microscope is 10 × 20 = 200.