1)why did an empty test tube placed obliquely in water,appears filled with mercury when seen from above?
2)why are bubbles rising up in the fish tank appear silvery??
#)why does crack in a window pane appear silvery??
want atleast 5 points for each question
PLZ FRNDS HELP ME!!!
Answers
Q-1-why does crack in a window pane appear silvery?
ans--this is due to total internal reflection and wave theory of light.
Q-2-why are bubbles rising up in the fish tank appear silvery
ans--bubbles rising up in a fish tank appear silvery air bubbles trapped in a glass paper weight appear silvery a crack in a window pane appears silvery top surface of water contained in a beaker and held above the eye level appears silvery how is totally reflecting prism is used as an erecting prism what do you understand by the term angle of minimum deviation ? in this position how is the angle of incidence related to angle of emergence
Answer:
Explanation:
a) An empty test tube placed in water with its mouth up ward and out side the water surface shines like mercury when seen at certain angle greater than critical angle of water. This is due to total internal reflection of light. (b) This is due to total internal reflection. When light rays strike the bubbles at angle greater than 48°C which is critical angle of water. (c) This is due to total internal reflection of light. Light rays strike the glass-air interface at angle more than critical angle of glass (42°) and get totally internally reflected. (d) A crack in a glass window pane appear silvery on account of the presence of air in the crack due to total internal reflection. (e) Diamond is cut in such a way that a number of refracting surfaces are present and total internal reflection takes place at a number of places and critical angle of diamond beings 24° cuts at very sharp angles are made so that the ray gets trapped with in the diamond for some time. (f) When light gets totally internally reflected at water air interface, it appears silvery