Question

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you are given lenses with power +10D,+5D,-5D,-20D and -10D. Taking a pair of lenses at a time, which two lenses will you select to have a combination of total focal length when the two lenses are kept in contact in each case (i) 20cm and (ii) -10cm

pls answer this question urgent ​

Answer 1

Answer:

-10 cm

Explanation:

because 10D +5D+5D= 20D-20D= 0D+-10D=-10D

Answer 2

Answer:

-10.. cm

Explanation:

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