In preferred embodiments of the invention, when the headlight is fitted on {HEAD ~ a vehicle}, the said first and second straight line motions are effected along {TAIL ~ a horizontal axis} and a vertical axis respectively 
In preferred embodiments of the invention , when the headlight is fitted on { HEAD ~ a vehicle } , the said first and second straight line motions are effected along { TAIL ~ a horizontal axis } and a vertical axis respectively
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH