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

Question

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

Quizplus · Accepted Answer

The combined power of lenses in contact is the sum of their individual powers: 70 + (-20) = 50 diopters.

Two Thin Lenses in Combination Are Placed in Contact with Each