Why Is The Power Of Plane Glass Zero? Focal length of a plane glass plate is infinity so its power is zero because power = 1/focal length. What is the power of plane glass mirror? The focal length of a plane mirror is infinity; its optical power is zero. What is the power of glass
What Will Happen If The Lens Is Lifted Slowly Up The Plate? Answer. As the lens is lifted the difference in optical path between the two reflected rays will vary, thus slowly converting bright rings to dark and vice versa. This will be periodic change. What will happen if the lenses slowly lifted off the
What Is A Dry Plate In Photography? Dry plate, in photography, glass plate coated with a gelatin emulsion of silver bromide. It can be stored until exposure, and after exposure it can be brought back to a darkroom for development at leisure. … The dry plate, which could be factory produced, was introduced in 1871