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 50 and -30 diopters,respectively.What is their combined power?

• A)10 diopters
• B)20 diopters
• C)80 diopters
• D)-10 diopters

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