Physics miscellaneousHard
Question
A large glass slab 
of thickness 8 cm is placed over a point source of light on a plane surface. It is seen that light emerges out of the top surface of the slab from a circular area of radius R cm. What is the value of R?
of thickness 8 cm is placed over a point source of light on a plane surface. It is seen that light emerges out of the top surface of the slab from a circular area of radius R cm. What is the value of R?Options
A.6 cm
B.12 cm
C.3 cm
D.18 cm
Solution
sin θC =
⇒ θC = 37o∴
= tan 37o = 
⇒ r = 6cmCreate a free account to view solution
View Solution FreeMore Physics miscellaneous Questions
A diver at a depth of 12 m in water (μ = 4/3) sees the sky in a cone of semi-vertical angle :-...A wire of resistance 4Ω is stretched to twice its original length. The resistance of stretched wire would be :-...The correct arrangement for taking temperature in the study of the temperature-time graph is shown in figure...The potential difference between point A & B in steady state will be :-...Ratio of the ranges of the bullets fired from a gun at angle θ, 2θ & 4θ is found in the ratio x : 2 : 2, ...