The right lens of Frank\'s contact lenses is a converging lensof +2.50 diopters.

Question

The right lens of Frank's contact lenses is a converging lensof +2.50 diopters. He can read a book held as close as 25 cm fromhis eyes. Without his lenses, Frank's right eye has

a. a near point of 15.4 cm.
b. a near point of 66.7 cm.
c. a far point of 40.0 cm.
d. a far point of 66.7 cm.
e. a far point of 15.4 cm. The right lens of Frank's contact lenses is a converging lensof +2.50 diopters. He can read a book held as close as 25 cm fromhis eyes. Without his lenses, Frank's right eye has a near point of 15.4 cm. a near point of 66.7 cm. a far point of 40.0 cm. a far point of 66.7 cm. a far point of 15.4 cm.

Explanation / Answer

Given :                1/ f   = + 2.50  m-1              or   f   =   0.4 m                         =  40 cm Given     Object distance (u)  = 25 cm    We have :                  1/ f   =   1/ u + 1/ v             or 1/v   =   1/ f   - 1/u                          = 1/ 40 - 1/25                 v    =   -66.7   cm Without his lenses, Frank's right eyehas  a near point of 66.7 cm. Hope this helps u!

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