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Two Thin Lenses in Combination Are Placed in Contact with Each

Question 39

Multiple Choice

Two thin lenses in combination are placed in contact with each other along a common axis.They have powers of 70 and -20 diopters,respectively.What is their combined power?


A) 25 diopters
B) 50 diopters
C) 90 diopters
D) -25 diopters
E) ​70 diopters

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