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Q. 75

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 993

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Short Answer

A lens placed in front of an object creates an upright image twice the height of the object. The lens is then moved along the optical axis until it creates an inverted image twice the height of the object. How far did the lens move?

The lens will move .

See the step by step solution

Step by Step Solution

Step 1: Given information

We have given,

object distance from the lens = ,

image height = ,

image formed = upright.

We have to find how far did the lens move to obtain the inverted image.

Step 2: Simplify

Magnification of the lens

We know that for a lens to get an upright image that is 2 times magnified, the object is between the lens and the focal point.

lens equation

Step 3: Simplify

After the lens has moved:

Using lens equation:

then, lens has moved=

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