y x x x Explain that light travels in a straight line until it strikes an object (e.g., reflected by a mirror, refracted by a lens or absorbed by an object).
(y; Explain; that light travels in a straight line until it strikes an object (e.g., reflected by a mirror,) Context(y Explain,List([0, 15))):(that light; travels; T:until it strikes an object) (a mirror; absorbed; by an object) (it; strikes; an object) (a mirror; refracted; by a lens)
y Explain,List([0, 15))
y that light a mirror it a mirror
Explain travels absorbed strikes refracted
that light travels in a straight line until it strikes an object (e.g., reflected by a mirror,
T:until it strikes an object
by an object
an object
by a lens