A slab of material 1 rests on the surface of a slab of material 2 ...

[Evvie72]

A slab of material 1 rests on the surface of a slab of material 2 . A light ray in material 1 has an angle of incidence of 30 on the interface between the materials, while the ray in material 2 has an angle of refraction of 45. What is the critical angle of incidence for total internal reflection for a ray of light going from material 2 to material 1?
 a. 30
  b. 45
  c. In this case there is no critical angle.
  d. At least one of the indices of refraction or its equivalent is needed to solve this problem.

Question 2

A windowpane is half a centimeter thick and has an area of 2.0 m2 . The temperature difference between the inside and outside surfaces of the pane is 15C. What is the rate of heat flow through this window? (Thermal conductivity for this glass is 0.84 W / m C.)
 a. 5000 J/s
  c. 1300 J/s
  b. 2500 J/s
  d. 630 J/s

[jliusyl]

Answer to Question 1

B

Answer to Question 2

A

[Evvie72]

Thank you!

[jliusyl]

Always glad to help...