2007-06-12 20:49:44 · 7 answers · asked by meghalee d 1 in Science & Mathematics ➔ Physics
Refractive index of the glass is less than that of water. With a test tube, no matter how you look at it, you will get a reflection.
I think that's it. Can't be sure.
2007-06-12 20:57:16 · answer #1 · answered by Labsci 7 · 1⤊ 0⤋
this is total internal reflection .empty glass tube contains air
which is a rarer medium as compared to water (.glass usually act as an interface) as light enters air it bends away from the normal after a certain incidence angle it bends so much that it enters water again and does not go into air at all
hence the tube reflects the light falling on it just like mirror hence shines like it too
2007-06-14 23:31:51 · answer #2 · answered by wasif 2 · 0⤊ 0⤋
it shines due to reflection and total internal reflection..at the surface the light rays reflects n refracts so the continuous bending of light rays lead to shining of the glass tube in water
2007-06-12 21:00:01 · answer #3 · answered by Anonymous · 0⤊ 0⤋
it shines due to reflection and total internal reflection..at the surface the light rays reflects n refracts so the continuous bending of light rays lead to shining of the glass tube in water
2007-06-12 20:57:29 · answer #4 · answered by rash s 1 · 0⤊ 0⤋
The refractive index of glass is less than water. If a light enters from higher refractive medium to lower refractive medium it gets
reflected if the angle of incidence is greater than critical angle. Hence reflection occurs. This phenomenon can be seen in optic fibers.
2007-06-13 03:13:07 · answer #5 · answered by hari_wins 1 · 0⤊ 0⤋
this is due to total internal reflection occuring at the outer surface of tube. here light propagates from water to air(inside tube)
2007-06-12 20:59:33 · answer #6 · answered by technix 2 · 0⤊ 0⤋
if u have an encyclopedia ,take the letter T and you will find your answer there. "T" for Total Internal Reflection.
2007-06-12 21:08:53 · answer #7 · answered by tomboy scientist at work 1 · 0⤊ 0⤋