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Problem P. 3857. (January 2006)

P. 3857. Thomas is long-sighted. He is able to see clearly only those objects which are at least 1 m away. Find the power of the glasses through which he is able to read a book 25 cm away from his eyes.

(3 pont)

Deadline expired on 13 February 2006.


Statistics:

116 students sent a solution.
3 points:85 students.
0 point:23 students.
Unfair, not evaluated:8 solutions.

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