A capillary tube is made of glass with the index of refraction 3, outer radius of the tube is 30 cm. The tube is filled with a liquid with the index of refraction 2. What should be the minimum internal radius of the tube r so that any ray that hits the tube would enter the liquid -
Text Solution
Verified by ExpertsThe correct answer is:
A
θ < θ c
sin θ < sin θ c
sin θ < 
sin θ < 
when i is maximum θ is also max and if
sin θ max < 
light will enter in liquid.
i max = 
sin φ = 
= 
Apply sine rule 
= 
= 
= 
= sin θ 
< 
r > 
r > 
r > 15 cm
minimum radius = 15 cm
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