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## anonymous one year ago Suppose a beam of red light enters a plate of crown glass at an angle of incidence of 30 degrees. What is its angel of refraction? **will draw inside!** 19 degrees, 25 degrees, 30 degrees, or 78 degrees ?

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1. Michele_Laino

we have to apply the law of Snell

2. anonymous

|dw:1433267112100:dw|

3. Michele_Laino

$\Large {n_{air}}\sin {\theta _{air}} = {n_{glass}}\sin {\theta _{glass}}$

4. Michele_Laino

so we can write: $\Large 1 \times \sin 30 = 1.52 \times \sin {\theta _{glass}}$

5. anonymous

solving for sin theta glass?

6. Michele_Laino

yes! $\Large \sin {\theta _{glass}} = \frac{1}{{2 \times 1.52}} = ...$

7. anonymous

0.3289 ?

8. Michele_Laino

what is: arcsin(0.329)=...?

9. anonymous

19.2

10. Michele_Laino

that's right!

11. anonymous

Yay!! so our solution is 19 degrees?

12. Michele_Laino

yes!

13. anonymous

Yup!:)

14. anonymous

thank you1!:)

15. Michele_Laino

:)

16. anonymous

Welcome!:)

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