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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