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# Physics ISA refraction paper 2 watch

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I have the paper 2 coming up soon and I'm so stressed.

I'm having difficulty with the questioning and answering.

1. The context question
My results show that when you increase the angle of incidence you increase the angle of refraction.

This is the context: A lens manufacturer wants to design a lens that refracts the light so that it focuses the light to correct for sight defects. they need to investigate a factor that affects the angle of refraction. {this is question is what I need major help with}

2. why would I make changes to my method???
I know it supports my hypothesis. I guess I could do more repeats. I don't have anomalies though so how could answer this one???

3. what causes could make uncertainties in my measurements?
Ambient light maybe???? I have no clue!!!!! I must explain it too.

thankyou
2. What paper is this? A level physics?
3. 1. Right so lenses for glasses need a certain angle of incidence so that the angle of refraction focuses properly - look at some lens ray diagrams and you will see the refraction from the lens goes into the eye. Your investigation can help lens manufacturers work out what angle of incidence is needed so that you get a refraction value which is suitable for a specific prescription.

2. I don't think this question will come up (I've done the paper and don't remember it but not certain)
but you can repeat experiment and calculate a mean (you HAVE to explain how to calculate a mean - add all of the values and divide by the number of the values)

3. The measurements you are taking have small intervals between them. Degrees are a small measurement and therefore there is a high risk of inaccuracy for each reading.
4. I've got my exam 2 days from now and in pretty much the same dilemna as you.. you must have completed it by now. do you have tips that you can PLEASEEE share?

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Updated: March 13, 2016
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