A person cannot see distinctly any object placed beyond 40 cm from his eye. What is the power of the lens which will enable him to see distant stars clearly? |
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(a) |
+2.5 D |
(b) |
-2.5 D |
(c) |
+3.5 D |
(d) |
-3.5 D |
A person cannot see distinctly any object placed beyond 40 cm from his eye. What is the power of the lens which will enable him to see distant stars clearly? |
|||||||
(a) |
+2.5 D |
(b) |
-2.5 D |
(c) |
+3.5 D |
(d) |
-3.5 D |