Magnification produced by a concave lens is always

Asked by admin @ 29/08/2021 in Physics viewed by 307 People

Why is the magnification produced by a concave lens always less than 1?

Answered by admin @ 29/08/2021

The magnification for lenses and mirrors is defined as the image height divided by the object height. It can easily be shown to be equal to the distance of the image from the lens divided by the distance of the object.

For a concave lens, the “magnification” is always less than 1. In other words, the image is actually smaller than the object.

The distance of a virtual image is very hard to gauge. So calculating magnification from object and image distances may not be accurate. Measuring image height may also be difficult making magnification through the ratio of heights just as difficult. The only other way left that may be easier is to measure the angular diameter of image and object (by shifting lens to side) to get a close enough estimate for magnification.

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Magnification produced by a concave lens is always

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