Light and Optics Review

Light and Optics Review

1. Describe how light from the light bulb is reflected off the

girl and the mirror

From the girl it is ______reflected

From the mirror it is ______reflected

2. Draw a ray reflecting off the plane mirror from the

boy’s collar to his eye. Draw in the normal line.

Is the image real or virtual? How do you know?

______

If the boy moves further away from the mirror what will happen to the image of him? (bigger,smaller,nearer,further?)

______

3.

4. Define index of refraction:

5. a) Material A has a higher index of refraction than material B. In which material will

light travel the fastest? ______

b)  In material A the light is traveling 75% (0.75) of its speed in a vacuum. What is

the index of refraction of material A?

c)  Show what happens to the incident ray shown below. (Assume the incident angle

is less than the critical angle). Draw and label the normal, incident and refracted

angles

6. What is a mirage? ______

7. Why are glass fibers used for telecommunications? ______

______

8. What type of lens is used to correct “farsighted” vision impairment? Explain why?

______lens because ______

______

9. Locate the image of the object placed in front of the mirror below. Describe the image.

10. Locate the image of the object placed in front of the lens below. Describe the image.