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GRADE 11 OPTICS REVIEW



TEST OUTLINE:
  1. pinhole camera (concepts and calculation) - not in the textbook, so refer to your notes.
  2. Ray Diagram:   pinhole camera
  3. refraction (concepts and calculations using the 3 equations, including Snell's Law.   See examples on page 334 - 337
  4. Critical angle and Total Internal Reflection: example on page 342
  5. calculations using Thin Lens Equation.   See example on page 363
  6. Ray Diagram:   convex lenses
  7. plane mirrors (law of reflection): page 330 for example
  8. Ray Diagram:   plane mirror
  9. Ray Diagram:   concave mirrors
  10. optical devices:   you are expected to know a bit (ie: 2 marks) about each optical device you observed during the presentations.  This information will be taken from the handout provided by each group.
  11. Be prepared for a major question on any optical device.



SPH3U                                         TEST: GEOMETRIC OPTICS

                                                                                                                                        NAME:______

 

1.         Fill in the blanks, below, with a term relating to light or its definition. 1(a) has been completed as an example.

 

            (a)      Reflection:                              This property can be seen when light hits a brightly polished surface and bounces back  

 

1 mark(b)       Rectalinear Propagation:        ____________________________________________

                                                                        ____________________________________________

 

1 mark(c)       ____________________:       Light bends when it passes from one material into another with a different optical density.

 

1 mark(d)       ____________________:       ratio of speed of light in a vacuum (c) to the speed of light in a given material (v).

 

2 marks(e)      Angle of incidence:                ____________________________________________

________________________________________________________________________________________

 1 mark(f)____________________:    This type of material absorbs energy, then releases this energy as light over an extended period of time.

 

1 mark(g)       Incandescent:                          ________________________________________________________________________________________

 

 

2.         Draw a ray diagram (to scale) for the following convex lens using the grid below. Use the ray diagram to identify the three characteristics of the image formed.

4 marks

            h0 = 2 cm,       d0 = 10 cm,     f = 6 cm,         

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 marks

3.         Draw a labelled sketch of a pinhole camera including:

            - image height -image distance

            -object height              -object distance

            -the path of the light rays through the device

 Light travels from medium A to medium B. The angle of refraction is less than the angle of incidence.

 2 marks(a)      Which medium has the higher index of refraction? (support your answer with a brief explanation or calculation)



 

2 marks(b)      In which medium does the light travel at a slower speed? (again, support your answer with a brief explanation or calculation)



 

3 marks

4.         A converging lens of diamond (n = 2.42) and a lens of glass (n = 1.42) have exactly the same shape. Which lens will have the larger focal length? Explain your answer.



3 marks

5.         A camera lens has a focal length of 6.0 cm and is located 7.0 cm from the film. How far from the lens is the object positioned if a clear image has been produced on the film?






4 marks

6.         From inside an aquarium, a ray of light is directed at the glass so that the angle of incidence, in water, is 30o.

 

            Determine the angle of refraction when the ray emerges from the glass into the air.

DATA:           nglass = 1.5

                        nwater = 1.33 nair = 1.0

 

 




QUESTIONS ON OPTICAL DEVICES

2 marks

7.         What is the function of the lens in the human eye?




2 marks

8.         Briefly describe the cause of “parallax” error as it occurs in a camera.

 

 

 

1 mark

9.         Since convex lenses produce an inverted real image, briefly describe how binoculars overcome this problem to produce an upright image.

 

 

 

2 marks

10.       Describe two properties of laser light.



 

11.       Explain why light travelling along a fibre optic cable stays contained within the cable, rather than escaping to the outside.

2 marks

 

 

 

12.       Briefly describe how one type of hologram is made.

2 marks



10 marks

13.       Describe a technology which uses the properties of light in its operation. Possible topics include cameras, fibre optics, holograms, the eye, binoculars, lasers, or microscopes. Your answer must include, in great detail, how the device operates with specific reference to the properties/behaviour of light involved.










test total: __ marks