a reflection is formed when rays of light bounces off an object onto a smooth shiny surface (such that light rays are reflected off at the same angles) and reflects off it into our eyes.
when the surface is rough there wouldn't be a reflection as lights rays from an object is reflected off the rough surface at different angles and does not enter our eyes
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Due to multiple reflection!
Lines will be formed at the opposite side of the observer if the ruled surface of grating faces the collimator due to reflection
yes.
reflection
Reflection off of rough surfaces is called a perkokepuw.