Qualification > Sciences
IGCSE PHYSICS DOUBTS HERE !!!!
**RoRo**:
--- Quote from: Relina on May 24, 2011, 01:58:09 pm ---hello plz anyone can help with the refractive index issue as i noticed that there ws a conflict between
May/June 2005 Q6
May?june 2009 Q 8
--- End quote ---
The refractive index is different every time, it depends on the frequency of light that passes through what sort of material, it'll be given to you, or you'd have to calculate it using the formula(s) that you've learnt.
~ Miss Relina ~:
--- Quote from: The Secret on May 24, 2011, 03:21:32 pm ---The refractive index is different every time, it depends on the frequency of light that passes through what sort of material, it'll be given to you, or you'd have to calculate it using the formula(s) that you've learnt.
--- End quote ---
the problemis that each q asks to bring the same thing but each one used different way of refractive index one used sin(i)/sin(r)and the other used sin(r)/sin(i) even both moved from the more dense to less dense so why ???
**RoRo**:
--- Quote from: Relina on May 24, 2011, 04:18:20 pm ---the problemis that each q asks to bring the same thing but each one used different way of refractive index one used sin(i)/sin(r)and the other used sin(r)/sin(i) even both moved from the more dense to less dense so why ???
--- End quote ---
The correct formula that you can use in both cases is Sin i/Sin r, it's acceptable in both the questions.
~ Miss Relina ~:
--- Quote from: The Secret on May 24, 2011, 05:04:36 pm ---The correct formula that you can use in both cases is Sin i/Sin r, it's acceptable in both the questions.
--- End quote ---
but if u apply this in may 2009 it will not work ???
**RoRo**:
--- Quote from: Relina on May 24, 2011, 05:51:48 pm ---but if u apply this in may 2009 it will not work ???
--- End quote ---
Here's what the MS says:
n = sin i / sin r OR n = sin r / sin i OR 1.49 = sin i / sin 35 C1
(allow 1.49 or refractive index instead of n in any of above)
58.719° to at least 2 s.f. Allow 58.71°
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