Different type of thread...who here is a SMRT?

[serial_fool]

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.

[needfordspeed]

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

[back2back]

SMRT, I mean SMART!

[serial_fool]

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

[lukeh]

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

[EDFalcon]

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

[Kyle the ED4LTR]

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

[EDFalcon]

Quick answers (the ones without calcs)


2a)

2b) The circle forms where the medium changes

[EDFalcon]

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

[serial_fool]

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

Thanks for rigging them up.

[EDFalcon]

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!!!

[serial_fool]

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.