Boosted Falcon

G'day fellas,

Sorry to introduce my petty homework troubles onto boostedeseries but Im really stuck on a few Physics questions in relation to refraction.

"1. The lens of a camera has a focal length of 10 CM. How far must the lens be from the film so as to get a clear image of an object at;

A) Infinity

B) 20 CM

C) 100 CM


2. A small light at the bottom of a pool of water (of refractive index 1.33) 1 Meter deep, emits light rays upwards in all directions. At the top of the water a circle of light appears when viewed from above. Around this circle the rays reflect back into the water.

A) Draw a diagram to illustrate the situation.

B) Explain carefully why this circle has formed.

C) Calculate the diameter of the circle of light


3. XYZ is a triangular glass prism (n=1.5). Angle X is 30*, angle Z is 60* and angle Y is 90*. A ray of light strikes the center of side XY at 90*. Determine the path of the ray through the prism.

I would just like to see peoples thoughts on the questions and compare them with my eventual....answers.

Thanks." - Shameless copy and past from gtaforums and fordforums.


If anyone has any tips/hints/answers please shoot something my way.

haha your OD'ing mate, I fkn hated physics with a passion when I done it, i'd help ya but I forgot everything I learnt after the last exam

SMRT, I mean SMART!

Yeah, exactly what I plan to do in about 1 years time. But in the meantime.....fucking stuiped questions.

mate ive forgotten everything from first year physics so cant really help you other than to suggest you google "physics focal length" and similiar, when i was doing physics i found some really well set out websites with diagrams and moving files that explained things better than the lecturers did....then again pass mark was 50..and i got 50 lol so it couldnt have been that great at teaching me

gimme 10min to find and i'll see what i can do for ya... 4yrs of engineering must be worth something!!

i did year 11 physics and failed, so i cant help ya

Quick answers (the ones without calcs)


2a)

2b) The circle forms where the medium changes

This SHOULD answer question 1 but i could be wrong... hehe




Got my own study to do now sorry mate. Hope it helps.

ps. hope you like my paint skills

Nah thats a good set of efforts, thats gonna help a shitload.

Thanks for rigging them up.

no worries mate. any other questions shoot me a pm and i'll see what i can do tomorrow. If i dont know my brother will because he's a freaky genious. He topped monash uni mechanical engineering and got 4 international awards.... FREAK!!!

Unfortunately these last few questions are due tomorrow but thanks for the offer of some help. I wish I have 1/2 of the intelligence of you/ your brother.