Concave Mirrors (Day 2)
If you missed today:
1. We mentioned that the Reflection Lab is due today. This Friday the Magic Cylinder and Ray Diagram homework side sheets are due. And next week Monday everything is due for this unit, meaning Problem Sheet 1 (on the back of the objective sheet) and Problem Sheet 2 (that you are getting today) and The Ripple Tank Lab (that we work on Thursday and Friday all period in groups of 3)
2. We took the mirror equation and solved it for each of the variables getting a MAD (multiple then add then divide by that sum) Formula f = p*q/(p + q) where p = distance of the object and q = distance of the image and f = focal length
and two MSD (Mult. Subt. and divide by that difference) Formulas giving p = q * f / (q - f) and q = p* f / (p - f)
The above derivations speed up working with the adding and subtracting of factions in the original mirror equation, which is 1/f = 1/p + 1/q
3. We lined up single file and witnessed the another hot curved mirror demonstration where we got an light bulb to light without turning it on (in fact we removed the light bulb and it was still lit up in the socket). We used case 3 and a concave mirror to do this.
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4. Next we filled out all but four problems (for you to finish by next Monday for homework) on the Reflection of Light Homework Sheet #2
5. Next we did The Anti-Gravity Box where you can appear to float like in space. See if you can figure out how this was done.
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