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Class 10 Science Medium Mcq English Medium

A combination of two lenses in contact, with powers +2.0 D and +0.25 D, is equivalent to a single lens of power

Question
A combination of two lenses in contact, with powers +2.0 D and +0.25 D, is equivalent to a single lens of power
+1.75 D
+2.25 D
+2.0 D
+0.5 D
Answer
+2.25 D
Detailed Explanation
Net power = P1 + P2 = +2.0 D + 0.25 D = +2.25 D, as given in the chapter's example.
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