Question

24. Two lenses of power - 15 D and +5D are in contact
with each other. The focal length of the combination is
(a) +10 cm
(b) -20 cm
-10 cm
(d) +20 cm​

Answer 1

Answer:. - 10vm is write answer

Explanation:power is - 15

D = -5 subtract each

- 15-(-5)

-15+5

=. -10 cm

Answer 2

HOLA MATE!!! ✌

HERE IS YOUR ANSWER:-

Power of combination is -15D+ 5D = -10 D

Thus, focal length of combination is -

f= 1/P

f= 1/-10

f= -0. 1 m

f= -10cm

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