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Without Iris glasses, Isaac can see objects clearly only

Chapter 27, Problem 34P

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QUESTION:

Problem 34P

Without Iris glasses, Isaac can see objects clearly only if they are less than 4.5 m from his eyes. What focal length glasses worn 2.1 cm from his eyes will allow Isaac to see distant objects clearly?

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QUESTION:

Problem 34P

Without Iris glasses, Isaac can see objects clearly only if they are less than 4.5 m from his eyes. What focal length glasses worn 2.1 cm from his eyes will allow Isaac to see distant objects clearly?

ANSWER:

Step 1 of 2

Here we need to determine the focal length of the glasses. The distance of the glass from the eye is , and the person can see upto  distance.

In the given case, the image distance is given by,

                                        

Using  and ,

                                        

                                        

The object distance is taken to be .

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