Question

Place the straight object (pen/kebab stick/straw) so that it is half in and half out of water. Change the angle that the straight object makes with the surface of the water as shown in the diagram. Photograph what your long object looks like at different angles. Include a piece of paper with your name, student number and the date in the frame of the photograph. Describe how your observation changes as you change the angle. straight object This diagram shows where the straight object actually is not where it appears to be. You will observe where it appears to be.

Answer 1

Please note that,R1 and R2 are light rays coming from the far end of object submerdged.

1 Apparent Depth Real Debth 0 1 Depth Let us consider height/ length of object = e Depth of subrnerged object = (?) (soso) ² point represents tip of the object submerged. (0 ) point is the interpolated point when the refracted may reach the eye. It is to be observed that when light trovels from desser (water) to rearer (air) medium , the light coming from the object referacts away from the Normal. Hance the object seems bent. Let Apparent Depth = h , Real Depth = ha h = (2) ho where ne= refractive index of air, n = R. I of water [h, a cose]

Length of object=l

In our observation we found that,

The apparent depth of the object submerged is directly proportional to cosθ.So as we increase θ,there is decrease in apparent depth.

We also observed that the object appears bent due to refraction of light.