Polarization of light

Answer Key - Grade 11 Science Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   Unpolarized light of 200 W/m² passes two filters whose slots are 30° apart. How intense is the light after both, Ari?

   75 W/m²
2. 2.

   Unpolarized light of 120 W/m² passes two filters whose slots are 60° apart. How intense is the light after both, Bo?

   15 W/m²
4. 3.

   Using the table, why does 30° give 60 W/m², Kira?

   • 80 × cos 30° = 60
   • 80 − 30 + 10 = 60
   • 80 × cos² 30° = 60
5. 4.

   Using the table, why does 60° give 20 W/m², Luz?

   Use the picture in question 3.

   • 80 × cos² 60° = 20
   • 80 × cos 60° = 20
   • 80 ÷ 4 since 60 is 4 × 15
6. 5.

   Two filters are crossed at 90°. How much light gets through both, Milo?

   • A quarter
   • Half
   • No light
7. 6.

   A third filter at 45° is slipped between two crossed filters. What happens, Noah?

   • Still no light
   • More light than before any filters
   • Some light gets through
8. 7.

   Two filters have their slots lined up. What fraction of the light from the first passes the second, Pia?

   • Half of it
   • All of it
   • None of it
9. 8.

   Light reflected off a lake is mostly polarized in which direction, Ren?

   • Vertically
   • Horizontally
   • In many directions at once
10. 9.

    Which way should the slots in polarized sunglasses run to block glare off water, Tala?

    • At random
    • Side to side
    • Up and down
11. 10.

    Polarized sunglasses are turned 90° while looking at a lake. What happens to the glare, Zee?

    • It disappears more
    • Nothing changes
    • It comes back