passage: Light rays strike a reflecting surface .
  They are then reflected back .
  You can predict the angle of the reflected light .
  Imagine a ball bouncing off a surface .
  Light can do the same thing .
  That is , assuming the surface is shiny .
  So how do you know where light will go after it strikes a shiny surface ?
  It depends on how the light initially strikes the shiny object .
  Light does not always go straight toward a surface .
  Therefore , not all light bounces straight back .
  Sometimes , light can hit a surface at an angle .
  The angle at which it strikes the surface tells us how it will bounce off .
  While light is different to a ball , they react in a similar manner .
  Many sports rely on knowledge of reflection .
  Pool players know a lot about reflection .
  They take great care when they strike the pool ball .
  They need it to go to a certain place .
  They know the angle it will hit the side of the pool table .
query_and_answer: What information is useful to pool players when they strike a ball ? || They need to know about swimming.
evidences: Pool players know a lot about reflection . They take great care when they strike the pool ball . They need it to go to a certain place . They know the angle it will hit the side of the pool table .