Question

A lens used as a simple magnifier gives magnification of 6. What is its focal length?​

Answer 1

Answer:

10

Explanation:

The simple magnifier achieves angular magnification by permitting the placement of the object closer to the eye than the eye could normally focus.

The angular magnification if the object is positioned such that the image is at least distant vision is given by the relationships below

Mα = 25/f + 1 = 2.525 + 1 = 11

The angular magnification if the object is positioned such that the image is at infinity is given by the relationships below

Mα = 25/f = 25/2.5 = 10

Answer 2

Answer:

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