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prehisto

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## Homework Statement

The light beam travels from air into water,the angle of incidence is 60 degress. The bent beam creates point F on the bottom of eater tank.If we imagine extension of incident beam inside the water, we obtain point B on the bottom of water tank. The distance between F and B is 1m. Calculate the depth of the water.

http://[url=http://postimg.org/image/rw3c1zipn/][PLAIN]http://s33.postimg.org/rw3c1zipn/bilde.jpg

## Homework Equations

## The Attempt at a Solution

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First i used the Snells law to obtain the angle of the bent beam.

Second i thought i use trigonometric functions to obtain the height.

tg(angle1)=x/h and tg(angle2)=(x+1)/h

From which I obtained negative value of x, which confused me.

So guys, do you think this is the way to go or someone has any different ideas?

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