Optics Question 811
Question: A concave lens of glass, refractive index 1.5 has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a
Options:
A) convergent lens of focal length 3.5R
B) convergent lens of focal length 3.07R
C) divergent lens of focal length 3,5R
D) divergent lens of focal length 3.07R
Show Answer
Answer:
Correct Answer: A
Solution:
[a] Use lens maker’s formula
Now,
