by changing a voltage between the second voltage application electrode and the second opposing electrode, a change of focusing state is caused with respect to light that is {TAIL ~ incident} on {HEAD ~ the second phase} changing layer 
by changing a voltage between the second voltage application electrode and the second opposing electrode , a change of focusing state is caused with respect to light that is { TAIL ~ incident } on { HEAD ~ the second phase } changing layer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH