Optics 7 Question 33
34. Water (with refractive index ) in a tank is deep. Oil of refractive index lies on water making a convex surface of radius of curvature as shown. Consider oil to act as a thin lens. An object is placed above water surface. The location of its image is at above the bottom of the tank. Then is.
(2011)
s.
Show Answer
Solution:
Two refractions will take place, first from spherical surface and the other from the plane surface.
So, applying
two times with proper sign convention.
Ray of light is travelling downwards. Therefore, downward direction is taken as positive direction.
Solving these equations, we get,