Task 2: Refraction Refraction is the bending of the path of light when it passes from one kind of stuff into another. The Plexiglass Block Lay the block flat on a new sheet of paper on the cork board. Put a white pin against the back surface (near one end). Mark the edges of the block on the paper; be careful not to move the block during this experiment. Look through the front surface at the pin behind the block. Notice that the piece of pin seen through the plastic block doesn't usually line up with the piece of pin seen above the block. White Location of White Pin seen through glass When do you see both portions of the pin lined up?Stick 3. blue pin against the from surface of the block near the same end of the block as the white pin. Move around until you see the white pin, through the plastic, directly in line with the blue pin. Stick a red pin in the board near your eye so that, just like before, it seems that three pins are lined up: the red one near your eye, the blue one against the hunt surface, and the white one behind the block, seen through the plastic. You have found the path of light that bounces off the rst pin passes through that particular part of the front surface of the glass. Reposition the blue pin to another location and repeat the process of nding the light path, continuing farther down the block until you get to the far end of the block and you have about 5 positions measured. It might be hard to see the rear pin 'om the very end. Only go as far as you can reliably see the rear pin through the plastic. You have found the paths light takes from the rear pin through the plastic, and out the front surface. Does light follow the same path when it goes the opposite direction? Answer below, and explain how you found out. Remove the glass block and, using a ruler, connect up the various paths. Find the angles each line makes with the surface normal. Take a look at the diagram you have made. For a given path, is the angle from the surface normal greater in air or in plexiglass? Suppose you could look from inside the plexiglass block. Sketch the block below and show the light rays travelling 'om a point outside the block to a point inside the block. Then trace out, using a dashed line, the path where the light point appears to be coming 'om for an observer inside the block