A concave lens has a focal length of 50 cm. Its power is
Options
-
A.
+2 D
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B.
-2 D
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C.
+0.5 D
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D.
-0.5 D
-
E.
None of the above
Correct Answer (Detailed Explanation is Below)
B.
-2 D
Detailed Explanation
For a concave lens, focal length is negative. f = -0.50 m, therefore P = 1/f = -2 D.