Images I

PREFLIGHT

Please type your (first) name:

Please type your LAST NAME and LAST FOUR SS# digits:

IN:

The following three questions refer to the material you were to read in preparation for the lesson. Questions one and three require you to write a three or four sentence response. Number two is a multiple choice question. Click in the appropriate circle.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button at the bottom of this page. Don't submit more than once. (If you absolutely HAVE to resubmit it, put a note on the end to that effect.)

1.

We are all accustomed to mirrors that reverse our features. So the sweatshirt that says UAH, will read HAU in the mirror. But if you take 2 mirrors with a hinge, and set them exactly perpendicular (90 degrees) and then look in the mirror, your sweatshirt will read UAH again. How is this possible? What will you see on your sweatshirt if you set the mirrors at 60 degrees?

2.

Another mirror puzzle. In the figure at left, there are 3 coordinate axes in front of a mirror. Does the image in the mirror (the virtual image) have none or some or all the axes reversed? (Hint: how does this fit with the previous problem?)

Just the x-axis

Just the y-axis

All the axes

None of the axes

3.

A beam of light is incident upon a mirror. You can click-drag both the position and angle of this beam. Find the focal length of the mirror. Start

honors extra

You have probably all seen a "mirage" on the road as you approached a hill and could see level with the ground for a bit. Mirages seem to form best on days with bright sunlight, when the road is considerably hotter than the air. Page 873 explains how this happens. A similar thing happens in the ocean, but in this case, to sound waves. The Air Force, I am told, used this effect to contact downed pilots that landed in the ocean. The pilot would drop a "sonobuoy" that would sink to a predetermined depth and make lots of noise. Can you explain how this device helped them locate the pilot from hundreds of miles away (beyond radio contact)?

Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", etc.):

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button.

I received no help from anyone on this assignment.