Refraction and Snell's law
Grade 11 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
Use n = 1.00 for air. What is the critical angle for light inside water (n = 1.333) meeting a surface with air, to 0.1°, Ari?
Use n = 1.00 for air. What is the critical angle for light inside diamond (n = 2.417) meeting a surface with air, to 0.1°, Bo?
Use n = 1.00 for air. What is the critical angle for light inside Plexiglas (n = 1.49) meeting a surface with air, to 0.1°, Esme?
A ray inside water hits the surface at 60° to the normal. Water's critical angle is 48.6°. What happens, Jun?
- It leaves into the air at 60° to the normal
- It stops at the surface
- All of it reflects back into the water
How does an optical fiber carry light around a gentle bend, Kira?
- Total internal reflection at its walls
- The fiber glows on its own
- Light bends smoothly to follow the fiber's curve
Milo says light entering water from air bends away from the normal. Agree or disagree?
- Disagree: it bends toward the normal
- Agree: slower light bends away
- Agree: water pushes light away
Noah says a ray entering diamond from air bends away from the normal because diamond is so hard. Agree or disagree?
- Agree: hard materials push light away
- Disagree: it bends toward the normal
- Agree: diamond speeds light up
Pia says light going from air into water can be totally internally reflected. Agree or disagree?
- Disagree: it needs a higher index to a lower one
- Agree: any boundary can do it
- Agree: water reflects light that way
A material has an index of exactly 1.00, like a vacuum. How would a ray from a vacuum bend entering it, Ren?
- Away from the normal
- Not at all
- Toward the normal
How does a material's critical angle change as its index gets bigger, Zee?
- It gets smaller
- It stays at 90°
- It gets bigger