The power of the combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is |
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a) |
+1 D |
b) |
-1 D |
c) |
Zero |
d) |
-0.5 D |

The power of the combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is |
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a) |
+1 D |
b) |
-1 D |
c) |
Zero |
d) |
-0.5 D |

1 Answer - 5876 Votes

3537

= , both and are in cm.
=2-2.5=-0.5 D |