Numbered Heads Refraction Test Review

Numbered Heads Instructions

1. Form into the designated groups

2. Take out one full sheet of paper per group and list the name of the group at the top. Then list the names of the group members and place numbers next to each name (1, 2, 3…..If four members then write 4 also). It doesn’t matter who gets what number.

3. Hand the paper to the instructor. It will be used for assessment and graded.

4. Begin reviewing/ learning the listed concepts. Make up sample questions related to the concept. Try and figure out what question the teacher will ask. Time is limited; so don’t waste it!

5. Once you understand the concepts make sure each group members also understand by assessing them. Do not ask yes or no assessment questions.

Good Assessment. “Sam, could you show me how to do number three on the list?”

Poor Assessment. “Do you guys all know it?”

6. When the instructor calls a number randomly (ex. = 3) the three will go to a designated area alone and respond to a similar question. Make sure they have something to write with and a calculator. After they leave begin studying the next set of concepts for the next round.

7. After a short amount of time the person will then return to the group and their answer will be graded by the teacher and given to the entire group as a communal score.

8. The returning group member may be called again so they should receive extra instruction to help get caught up.

9. The scores are added at the end to determine winners. The top three groups receive extra points on the test.

Refraction Test Review concepts

1.   Memorize three formulas:  index of refraction,  snell's law and critical angle

2.  calculate angle of refraction using snell's two indices of refraction, and an incident angle

3.  calculate an index of refraction using the speed in the material

4.  Describe and calculate refraction bending in terms of the normal  when given different indices for two mediums

5.  calculate the critical angle

6.  Solve for object distance given q and f  for either diverging or converging lens

7.  Solve for object distance given f and the height of image and object.  Substitution required

8.  Solve for magnification given p and q

9.  Know the sign conventions for diverging and converging lenses

10.  Draw an image formed by converging lens when object is in various positions

11.  Draw an image formed by diverging lens