Question

an optical device is placed in front of distinct objects the screen is placed in front of it and adjust to get a sharp well-defined inverted image of object.name the device and name and define the point at which the screen is placed

Answer 1

Laws of reflection 
               I Law : The incident-ray, the reflected ray and the normal (at the point of incidence) all lie in the same plane. 
               II Law : The angel of reflection is equal to the angle of incidence.