4-PS4-2 - Develop a model to describe that light reflecting from objects and entering the eye allows objects to be seen.

Assessment Boundary - Assessment does not include knowledge of specific colors reflected and seen, the cellular mechanisms of vision, or how the retina works.

4-PS4-2 - Develop a model to describe that light must reflect off an object and enter the eye for the object to be seen.

Assessment Boundary - Specific colors reflected and seen, the cellular mechanisms of vision, angles of incidence and reflection, or how the retina works are not expected in state assessment.