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Focal length of glasses

  • Thread starter phy112
  • Start date
  • #1
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Homework Statement


Veronique is nearsighted; she cannot see clearly anything more than 6.50 m away without her contacts. One day she doesn't wear her contacts; rather, she wears an old pair of glasses prescribed when she could see clearly up to 8.00 m away. Assume the glasses are 2.0 cm from her eyes.

a. What is the focal length of Veronique's glasses?
b. What is the greatest distance an object can be placed so that she can see it clearly with these glasses?

Homework Equations



1/p-1/q=1/f

The Attempt at a Solution



I literally have no idea where to start. any hints appreciated
 

Answers and Replies

  • #2
37
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so i got -7.98 for the focal length. but i dont know how to do b
 

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