What is refraction?
  • The manipulation of light to form bright and dark spots by passing it through a narrow slit
  • The change in direction of light as it passes from one medium to another
  • The ability of light to spread out to fill a room
  • The ability of light to penetrate solid objects
How does a lens work?
  • It forms an image by refracting light
  • It forms an image by diffracting light
  • It forms an image by diffusing light
  • It takes a picture with a digital camera and tags it on Facebook for you to see
Consider a convex lens - parallel rays of light are brought to a focus at which point?
  • Secondary focus
  • Primary focus
  • Principal focus
  • Focal place
What is the distance from the lens to the principal focus called?
  • Focal width
  • Focal height
  • Focal length
  • Focal point
Which formula correctly states how refractive index is related to the angles of incidence and refraction?
  • refractive index = sin i⁄sin r
  • refractive index = sin r⁄sin i
  • refractive index = sin i⁄2 sin r
  • refractive index = 2 sin i⁄sin r
What does represent in the above equation?
  • The normal
  • The angle of refraction
  • The angle of incidence
  • The refractive index
The nature of an image produced by a lens is defined by which attributes?
  • The relative size of the image
  • Whether the image is upright or inverted relative to the object
  • Whether the image is real or virtual
  • All of the above
Which type of lens would be a good choice to use for the purposes of magnification?
  • Diverging lens
  • A concave lens
  • A converging lens
  • Bi concave lens
What is the refractive index of a medium when light is incident upon it at 45 to the normal and the angle of the refraction is 30 from the normal?
  • 1.1
  • 1.2
  • 1.3
  • 1.4
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