Refraction question

1. Oct 20, 2014

max1995

1. The problem statement, all variables and given/known data
Light travelling thorugh air is at incident at point x on the block of ice. If the refractive index is 1.3, calculate
a) the critical angle at the ice-air interface (3 marks)
b) the minimum angle of incidence, for the light to Y refracted out of the block at any point along the top surface (7 marks)

2. Relevant equations

3. The attempt at a solution
a) sin(θc)=1/nm
θ= sin-1(1/1.3)
θ= 50.3 (1 d.p)

is this right?

b) Need help on this one

2. Oct 20, 2014

Staff: Mentor

(a) is right.

For (b) there's a diagram to accompany it?

3. Oct 20, 2014

max1995

yep it is in the file i uploaded

Attached Files:

• image 1.docx
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4. Oct 20, 2014

max1995

thank you for helping btw :)

5. Oct 20, 2014

Staff: Mentor

I can view only jpegs, sorry.

6. Oct 20, 2014

max1995

Managed to turn it into jpeg

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• Untitled.jpg
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7. Oct 20, 2014

Staff: Mentor

I was anticipating there'd be a point Y. I find there is not.

Perhaps you meant to type
b) the minimum angle of incidence, for light to be refracted out of the block at any point along the top surface?

If so, start by drawing a large diagram with all straight lines (e.g., by using a ruler).

By "any point" I think they don't mean "every point", just at least some point.