Refraction and Snell's Law (no total internal reflection)

1. Which of these lines correctly shows the path of a ray of light through a block of glass?

2. What is the name given to the dotted line shown here?

• A. The perpendicular line
• B. The normal line
• C. The reference line
• D. The line of refraction

3. Which of the following statements are always true in this situation?

• A. I and II
• B. I and III
• C. II and III
• D. I, II and III

4. Which of these diagrams correctly shows the path of a ray?

5. Which of these statements best describes the light ray as it follows the correct path?

" As the ray enters the plastic from the air...

• A. .. it speeds up and bends away from the dotted line".
• B. .. it speeds up and bends towards the dotted line".
• C. .. it slows down and bends away from the dotted line".
• D. .. it slows down and bends towards the dotted line".

6+7: These questions are about the formula for refractive index:

6.Which of these formulas states "Snell's Law", used to show the relationship between the angle of incidence (i) and the angle of refraction (r)?

7. What is 'n' in this equation?

• A. The density of the substance.
• B. The speed of light in the substance.
• C. The refractive index of the substance.
• D. The volume of the substance.

8. The ray of light travels from air into a transparent solid. It has an angle of incidence of 40^o and an angle of refraction of 25^o.

What is the value of 'n' for the transparent solid?

• A. 1.52
• B. 0.66
• C. 0.03
• D. 1.60

9. If the angle of incidence is 45^o, what is the angle of refraction?

• A. 1.41^o
• B. 0.53^o
• C. 32^o
• D. 70^o

10. If the angle of refraction is 30^o, what is the angle of incidence?

• A. 1.52^o
• B. 0.67^o
• C. 22^o
• D. 41^o