Question

One student uses a lens of power +2.0 D
and another uses a lens of power-2.5 D what type of lenses are used by each
student​

Answer 1

Explanation:

The student using a lens of power +2.0 D uses a Convex type of lens while the student using of power -2.5 D uses Concave type of lens .

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Answer 2

Answer:

convex or concev mirror