Optics Question 661
Question: A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are joined together. The power of the combination will be
[MP PMT 2001]
Options:
A) ? 16 D
B) + 16 D
C) ? 6 D
D) + 6 D
Show Answer
Answer:
Correct Answer: C
Solution:
$ P=\frac{100}{f _{1}}+\frac{100}{f _{2}}=\frac{100}{(+25)}+\frac{100}{(-10)}=-6D $
