need help programming value of proximity sensor to sweep servo arm

Projects Programming
15 
if (vcnl.readAmbient() < 100);
  TinyServo.write(90);
  digitalWrite(ledPin, HIGH);

  {
    TinyServo.write(70);
    digitalWrite(ledPin, LOW);//
  }

First get rid of the ; (semi-colon) at the end of the if statement.
Then that says to move the servo and unconditionally turn the LED on if the light is below 100 then microseconds later turn the LED off. Put a delay after you turn the LED on and maybe you will be able to see it. I don't know what the curly brackets are for? Did you mean to stick an else in there?