You have a capillary tube in a capsule whose refractive index is $n = 2$. You notice that the radius of capillary tube seems $1.50mm$. What is the real radius of capillary tube?
I'm having trouble with this optics question.
Let's take a look at what we have:
Refractive index of capsule: $n = 2$
Radius of capillary tube: $1.50mm$
Refractive index of air: $n = 1$
Can I get your thinkings?