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The power of the combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is

a)

+1 D

b)

-1 D

c)

Zero

d)

-0.5 D


Question ID - 152849 | Toppr Answer

The power of the combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is

a)

+1 D

b)

-1 D

c)

Zero

d)

-0.5 D

1 Answer - 5876 Votes

3537

Answer Key : (d) -

(d)

= , both  and  are in cm.

(d)

= , both  and  are in cm.

=2-2.5=-0.5 D

=2-2.5=-0.5 D



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