Optics Question 820
Question: Two lenses of focal length $ f _{1}=10cm $ and $ f _{2}=20cm $ are kept as shown. The resultant power of combination will be
Options:
A) -10 D
B) 5 D
C) 0
D) 10 D
Show Answer
Answer:
Correct Answer: D
Solution:
[d] $ P=2[ \frac{100}{10}+\frac{100}{-20}+0 ]\text{ P=10 diotre}\text{.} $
