# Doubt From Tests

@AshWin bro 54th question is quite direct…
Just use the condition of y=x and differentiate the equation of circle twice…
Should i send the solution??

Thanks bro , I got it now .
Idk why test mein nahi hua.

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For the prism question… Is the answer 2??

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Yes , i got it ,i made a mistake in calc the sign of dr/dn , for first refraction it is coming -1/3 , i actually calc it as 1/3 due to silly mistake hence was getting 0 as the answer

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I didn’t get - 1/3 anywhere in my solution… … I think you solved it using some other method…

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I used snells laws and diff it ( one time for ray coming in and one for ray going out ) share your approach too

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I almost did the same…
I added the 2 equations and then differentiated it…

Thats better , when calc separately , i did sign mistakes.

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Anymore doubts??

I will be posting from fiitjee tests , but the test pdf is in pc . RN Study ko ja raha hu , evening tak bhejta.

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Fiitjee CRT tests?

I think the first Q is wrong , i feel something is wrong in it, please confirm.
@Aastik_Guru @Abhinav.08 @Amish_1706 @Navjeet_Kohli @manan_uppadhyay

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For the first one, I get these three equations. Distinct a,b,c are not possible imo

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Yes i also felt something is wrong with the question.
I wasnt able to form the equation , if i satisfy one condition , the other was not satisfied.

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Did anyone get the other 2 Q for this? @Aastik_Guru @manan_uppadhyay

try karta hu abhi

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guys i am facing problem in this question…can anyone give me detailed answer of this?

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Couldnt do.

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@mihir @AshWin can u solve my doubt

i am getting 4/5…

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