Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
jellybeans:
..help ? :)
dont get it :( is it cuz its.. totally internally reflecteeeed? :/
Ghost Of Highbury:
--- Quote from: jellybeans on May 25, 2010, 12:41:34 pm ---..help ? :)
dont get it :( is it cuz its.. totally internally reflecteeeed? :/
--- End quote ---
B?
Moonlyte:
--- Quote from: ambitious94 on May 25, 2010, 12:25:51 pm ---Happened to have just done that paper ;D
Okay, so let's eliminate the incorrect choices. C and D are IMPOSSIBLE. Why, since we want a CONVECTION current to be set up. so there has a to be a difference in temperatures of the particles, not simply moving them.
So now if we cool it at Y- since it is already at the bottom of the beaker, won't move upwards, so no current, it just stays where it is.
SO now the only plausible solution we have is A, so if we cool the water at X, it'll move downwards due to being denser n here you go- ur very own CONVECTION CURRENT ;D
Hope I made sense to u
--- End quote ---
thanks to you and everyone else who answered it! :)
holtadit:
--- Quote from: jellybeans on May 25, 2010, 12:41:34 pm ---..help ? :)
dont get it :( is it cuz its.. totally internally reflecteeeed? :/
--- End quote ---
Its B.
The ray travels along the normal and doesnt refract.
Then it hits the slanted edge of the prism and undergoes total internal reflection.
So its REFLECTED at an angle of 45 degrees downwards where it hits the prism side along the normal and without refracting.
Vin:
--- Quote from: A@di on May 25, 2010, 12:43:19 pm ---B?
--- End quote ---
yup ..
logic ?? only this one makes sense !! u gotta remember hoe reflection occurs in a a reflecting prism
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