Interference/Diffraction Shadows

[Aeighme]

Homework Statement

At 11:00hrs a vertical stick in air, 1.8 m long, casts a shadow 1.2 m long. If the same stick is placed at 11:00hrs in air in a flat bottomed pool of salt water half the height of the stick, how long is the shadow on the floor of the pool? (For this pool, n = 1.56.)

Homework Equations

Not sure...=/

The Attempt at a Solution

Don't know were to start >.<

 

[tiny-tim]

Don't know were to start >.<

Hi Aeighme!

Start by calculating the angle of the sun above the horizon.