Determine the focal length of a convex lens by focusing on an object across the

Question

Determine the focal length of a convex lens by focusing on an object across the room. If the object is 9.9 m away and the image is 10.3 cm, what is the focal length? (Hint: use Lab Manual Equation 4.2: 1/o+1/i=1/f) Suppose one estimated the focal length by assuming f = i. What is the discrepancy between this approximate value and the true value? (Hint: When the difference between 2 numbers is much smaller than the original numbers, round-off error becomes important. So you may need to keep more digits than usual in calculating the discrepancy.)

Answers

____________ cm

_____________ %

Explanation / Answer

   given that object distance o=9.9cm
   image distance i=10.3cm
   from the focal length equation
   1/o+1/i=1/f
   1/f=1/9.9+1/10.3
   =0.198
   focal length f=5.048cm

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