SNC 2DLight & Optics Review
  1. A ray of light travelling through air and entering glass at an oblique angle will

a)speed up onlyd)bend away from the normal only

b)slow down onlye)slow down and bend toward the normal

c)bend toward the normal only

  1. A line is drawn perpendicular to the surface of a concave mirror. Such a line is called

a)the angle of incidenced)the path of light from the image

b)the centre of curvaturee)the normal at that point on the mirror

c)the principal focus

  1. A light ray travelling parallel to the principal axis of a concave mirror hits the mirror. It will be

a)reflected through the principal focusd)refracted through the optical centre

b)refracted through the principal focuse)reflected back along its original path

c)reflected through the centre of curvature

  1. When a ray of light travels from glass to air at an angle of incidence of 0, most of the light

a)travels straight throughd)reflects at an angle of reflection of 90

b)bends away from the normale)reflects straight back

c)bends towards the normal

  1. Which of the following statements is not correct for a simple magnifying glass?

a)The image is virtual. d)The lens is concave (diverging).

b)The image is erect. e) The object is placed inside the focus of the lens.

c)The image is larger.

  1. A distant object is slowly brought from a great distance toward the centre of curvature of a concave mirror. The image will

a)remain virtual and become smallerd)remain real and become smaller

b)remain virtual and become largere)remain real and become a point

c)remain real and become larger

  1. Which one of the following characteristics does not apply to the image formed by a concave (diverging) lens? The image is:

a)virtuald)located between the lens and its focal point

b)invertede)smaller than the object

c)located on the same side of the lens as the object

  1. Where must an object be placed with respect to a convex (converging) lens in order to obtain a virtual image?

a)at the principal focus

b)at twice the focal length

c)at a distance greater than twice the focal length

d)between the principal focus and the lens

e)between the principal focus and twice the focal length

  1. If a ray of light is incident on a flat glass surface at an angle of 45 the angle of refraction will be

a)equal to the angle of incidenced)equal to the angle of reflection

b)less than the angle of reflectione)independent of the angle of reflection

c)greater than the angle of incidence

  1. What conditions must exist for total internal reflection to occur?
  1. As the index of refraction for a material gets larger, what happens to the critical angle?
  1. Why does the passenger side mirror of a car have the words: “OBJECTS IN MIRROR ARE CLOSER THAN THEY APPEAR”? In your explanation, include what type of mirror this is, and what you are actually seeing.
  1. Explain how the human eye can see the image on this paper. Start with “light from the ceiling fixtures reflects off the paper and then…”
  1. How can two convex lenses be used to make a compound microscope? Why is the image larger and inverted?

Answers:1. e)2. e)3. a)4. a)5. d)6. c)7. b)8. d)9. b)

10. light must be in a mat’l with higher index going to lower index, incident angle must be larger than critical angle; 11. it gets smaller; 12. in a convex mirror, objects are always smaller so they seem farther to you

From the textbook:

Ch. 11 Review p. 506

#1, 3, 5, 6, 7, 9, 10, 11, 13, 18, 19

Ch. 12 Review p. 542

#1, 2, 3, 4, 6, 9, 10, 12, 15, 18, 21a

Ch. 13 Review p. 582

#1, 5, 8, 9, 10, 13, 14, 17, 18, 20b, c, 23

\snc2D\optics\optics_review s13.doc