1yaar 4 question 21 this is an established formula which i dont no 4m where to get....
consider 5 identical rt angled isosceles prism of ref ind μ1,μ2,........μ5 resp
theyr arranged touching each other ( imagine 3 of em placed in str line and 2 of em placed btw the gaps by inverting them )
they r in order 1,2,3,4,5
given that in ray from air is at grazing incidence and final out ray also at grazing emergence
now prove
μ1^2 + μ3^2 + μ5^2 = 2 + μ2^2 + μ4^2
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72 Answers
11cel in question 16 it is given that no force acts at hinge so only linear momentum is conserved
9sid can u show ur calc for 19 pls im really unable to take ur approach
21) some more exp please
9and 16 shd be d na , cos in process a force acts in future at hinge converting linear momentum to angular momentum but maintaining tot energy
21Thnx a lot buddy!!!
this paper will help a lot of us........
GR8 work!!!!
I had cn dat 5prisms que also in a coaching institute question bank but cudnt get da soln!!!!!
9ok i ll post all qs at end i need help for certain q,s also check if my ans are wrong
ignore my scribblings on the paper ;)
9another imp q
an electrostatic field line frm point charge q1 leaves at angle α and connects with point charge -q2 at angle β wrt line joining them
then
q1/q2 = ?
a) sin2β/sin2α
b) tanβ/tanα
c) sin2β/2 /sin2α/2
d) cosβ / cos α
11can u please post the entire paper it will be beneficial to those who dint take it
3Hey, can u explain ur answer of that section A, Q 21 and Q 19 ? I too appeared for INPhO 09, but m not v. sure what is the anwer. .
9no dint but inmo this year was easiest ever ,solved it for fun
21oh k gr8 man.... lovely score yaar!!!!!
hey did u appear for INMO???
how was it???
ne other que which u hav dbts abt or found it diff?
9@tapanmas yes the paper seems to be easy but then time limit of 3 hrs is also dere
also there are 20 more q s that ill post later
cudnt solve that prism q in exam hall bt later in my house solved (its good that i left it it wud ve taken neways 10 min to solve co pretty lenghty )
otherwise attempted 78.5 / 80 in that i wud ve made mistakes for 8.5 (hopefully not) so rough esti of 70