Look at the circuit shown. You recognize the same circuit, however the anode of the diode is now connected to the negative terminal of the battery.
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 Circuit with a diode in reverse direction. (Enlarge)  | 
      
 
 Circuit diagram with a diode in reverse direction.  | 
      
  
Now the light bulb remains dark. The diode will not let current pass, it is connected in the so-called reverse direction.
In the next experiment you get to know the ideal diode.