IIT JEE , AIEEE Forum - Physics , Optics

kislay

light is incident from glass(n=1.5) to water (n=1.33)find the range of angle of incidence for which there are two angle of incidence?????

i wanna ask what here two angle of incidence means???

bvsatyaram

I strongly believe that there is a mistake in the problem. It should be "2 angles of transmission", instead of incidence.

Now, going ahead with this point, given a ray going towards on a surface interface, the ray gets partially reflected and partially refracted (2 angles of transmission). But, if thh angle of incidence is greater than a critical value, then only reflection takes place (total internal reflection, hence, 1 angle of transmission).

kislay

sir the question is correct...
it is given in hc verma
and dc pandey's book also.....the same question

bhuwanaroracorroded

1.5 sini=1.33 sin r

4 one value of r 2 have 2 angle of incidence

-1<sinr<1

find d range 4 i

apply d formulae 4 getin d general sol. of value of theta in sin

see 4 which value of r is same

pratyush.pande

but bhuvan u see sine cannot have a -ve value as angle i or angle r can have value in between 0 to 90 so no ques of sine being -ve

bhuwanaroracorroded

pratyush.pande

i dont think whether it wud give the ans as sine cannot have 2 same values b/w 0 to 90...and moreover if bhuwan u understand wat the ques means cud u pl explain it coz i cant make out ne case with 2 i for the same deviation...this is possible for a prism but for a single interface i cannot make out

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