Optics Question 697
Question: If two lenses of +5 diopters are mounted at some distance apart, the equivalent power will always be negative if the distance is
[BCECE 2005]
Options:
A) Greater than 40 cm
B) Equal to 40 cm
C) Equal to 10 cm
D) Less than 10 cm
Show Answer
Answer:
Correct Answer: A
Solution:
Using
for equivalent power to be negative
Therefore
Therefore
Therefore
Therefore
