Refraction & Lenses Review

1. Refraction occurs because light travels faster in other materials than in a vacuum.

A. TrueB. False

2. What is an example of total internal reflection?A. Fiber opticsB. Laser beamsC. Spherical mirrorsD. Spherical lenses

3. Total internal reflection only occurs when light travelsA. Between mediums with equal indexes of refractionB. From a medium of higher index of refraction to a medium of lower

index of refraction.C. From a medium of lower index of refraction to a medium of higher

index of refraction.

4. The sketch shows a light ray moving from glass into air at 30 to the normal. Which of the three is most likely the light ray that continues in the air?

5. How does the speed in medium 3 compare to medium 2?

A. FasterB. SlowerC.Cannot be determinedD.The same

6. How does the optical density of medium A compare to medium B?

A. nA>nB

B. nA<nB

C. nA=nB

7. Real images are created with converging lenses whenA. The object is between the focal point and the lens.B. The object is beyond the focal point and the lensC. The object is on the focal point.

8. An image is created 15 cm from a converging lens after an object is placed 45cm from the lens. What is the focal length?

(First 5 who show me the correct answer with work gets candy)

9. Which best describes the image created by diverging lenses?A. Virtual, inverted, largerB. Virtual, upright, largerC. Virtual, upright, smallerD. Real, upright, smallerE. Real, inverted, larger

10. What type of lens is used to correct nearsightedness?

A. DivergingB. Converging

11.Where will the image appear?

A. On the left, at the zero mark.

B. On the right, at the 150 mark.

C. On the right, at the 200 mark.

D. On the right, at the 300 mark.

12. How will the image look?

A. Same sizeB. SmallerC. LargerD. Same sizeE. Smaller

13. If the lens had a lower index of refraction, the focal length will

A. Same sizeB. SmallerC. Larger

14. When an object is placed on the focal point, no image is created. This happens with

A. Convex lenses & concave mirrorsB. Convex lenses & convex mirrorsC. Concave lenses & concave mirrorsD. Concave lenses & convex mirrors

15. Describe the characteristics of the image created by the following diagram.

A. Upright, virtual, B. Upright, realC. Inverted, realD. Inverted, virtual

16. Describe the characteristics of the image created by the following diagram.

A. Upright, virtual, B. Upright, realC. Inverted, realD. Inverted, virtual

17. A card is placed in front of the object as shown. What happens to the image?

A. Gets brighterB. Gets dimmerC. Not affected.D. Broken or no image

18. A card is placed in front of the lens below. What happens to the image?

A. Gets brighterB. Gets dimmerC. Broken or no imageD. Not affected.

19. A virtual image is created 30 cm from a converging lens after an object is placed 12 cm from the lens. What is the focal length?

(First 5 who show me the correct answer with work gets candy)

20 cm

Question 20

Question 21