You can determine the index of refraction of a substance by determining its critical angle. (a) What is the index of refraction of a substance that has a critical angle of 460 when submerged in water (nwater = 1.333)? Your answer should be a number with three decimal places, do not include the unit.

Complete Question

You can determine the index of refraction of a substance by determining its critical angle. (a) What is the index of refraction of a substance that has a critical angle of when submerged in water ()? (b)What would the critical angle be for this substance in air()

Your answer should be a number with three decimal places, do not include the unit.

a

b

Explanation:

From question we are told that  

   The critical angle is  

    The refractive index of water is  

Generally the critical angle is mathematically represented as

Considering question a

Here

So

=>  

=>  

Considering question b

Generally the critical angle is mathematically represented as

Here

=>  

b) 10 minutes

girls stopped for 10 minutes.