5-15

Today, May 15, 2009 we had another great class period in Mr. Manning's third period class. We started off the day with information on Hershey Park. Only four more class periods until the big day! Anyway, Mr. Manning gave us some information on the day and he collected the last permission slips which were due. Anfter Mr. Manning informed us about Thursday, we did two Daily Questions. Here is what they were:

Daily Question one: In order that you are able to see a full-length view of yourself, the minimum size for a plane mirror must be? (there was a picture of a guy infron of a full length mirror)

a) One-quarter your height b) One-half your height c) Three-quarters your height d) Your full height e) ... Depends on your distance

Answer: b because it is consistent with the law of reflection. If you look half way down a plane mirror in front of you, you'll see your toes. You will only see the floor if you look below the half way mark. If you look straight ahead you'll see your eyes. If you look above at a distance half way fromnm your eyes to the top of your head you'll see the top of your head. Half way up; half way down- that's a mirror one-half your height. Distance is NOT a factor.

Daily Question two: (a women is holding a little mirror in front of her face) To see more of her head in the mirror, she...? a) Should hold the mirror closer b) Should hold the mirror farther away c) Needs a bigger mirror

Answer: c because if she holds the mirror closer, her image appears bigger, but so does the mirror. If she hold it further away, both her image and the mirror are proportionally reduced.

~ After the last daily question, we tried it ourselves! Mr. Manning gave us small mirrors and we witnessed that no matter what the size of the mirror is or what distance you look at it from, you always see the same part of your face. It was quite amazing.

Then we handed back in the mirrors and worked on the Law of Reflection Worksheet for the rest of the period. We used a ruler and protractor to reflect lines off of different angles. From this worksheet we learned that an incoming angle (incident) measured from the normal line is equal to the reflected angle measured from the normal line but on the opposite side of the normal. The normal line is perpendicular to the suface of the mirror and is the point where the light rays strike.

Here is a graphic to give you a better understanding:

Homework: Get Ready for Hershey Park!