Rami Arieli: "The
Laser Adventure" Snell Game Applet
Applet: Snell's Shooting Game
You are in the room on right (as seen from above), and your mission
is to Hit the target located in
the left room.
You have a laser, which emit a short laser pulse of high energy.
Each time you have only one shot !
Between the rooms, the wall is opaque, but there is a transparent
glass (n = 1.5) cylindrical with 1 meter diameter (Seen
as a circle in the picture).
As a result, a shot will be fired from the laser to the direction on the
Position the laser in the room, with a click
on the left button of the mouse. The location of the
cursor is the new location of the laser.
Mark the direction of the beam, by pointing on the glass cylinder, and
click on the right button of the
The computer will calculate the beam path, and show it on the screen.
It is prefered to think before the firing where to aim the beam
For the default values of n, when the laser
and the target are under the horizontal diameter, do you have to aim the
laser above or under the horizontal diameter, in order to hit the target?
What are the conditions on the values of n, such that you can not hit
the target, anywhere in the room?
As a conclusion from this activity, can there be a total
internal reflection in a transparent glass ball? If yes,
under what conditions?
When n1>>n2, Is your
answer to question 1 remains the same? Explain, and check possible cases.
When n1 = n2 , the beam
advance ___________ (fill in the blank). Is it possible to hit the target
under these conditions? Explain.
Can there be a case (under the simulation conditions) that the beam will
be reflected back and hit the shooter? (check your answer with the simul;ation).
Fill in the blanks:
When n1>n2 _______________________________________________
When n1<n2 _______________________________________________