Ravi is given lenses with powers
+ 5D, -5D, +10D, -10D and -20 D.
Considering a pair of lenses at a time, which
two lenses will he select to have
combination of total focal length when two
lenses are kept in contact in each case.
Answers
Answered by
0
Answer:
-20
Explanation:
total p = p1+p2+p3+p4+p5
Answered by
0
Answer:
the correct answer is -10D
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