9 A beautiful girl with two normal eyes wants to see full width of her face by a plane mirror - Physics - Ray Optics And Optical Instruments

Question

9 A beautiful girl with two normal eyes wants to see full width of
her face by a plane mirror The eye to eye and ear to ear distances
of her face at 4inch and 6inch respectively The minimum width of
the required mirror is ------------

Rupak Bhattacharya · Accepted Answer

Here the eye to eye separation = BD =4 inch and Ear to Ear separation = AF=6 inch
Now ray ABC is from the left ear gets reflected from the plane mirror to the eye C So AB=BC=AC/2Similarly DE=EF=DF/2So, minimum width of the mirror is = BE= CD+BC+DE=5 inch

9.A beautiful girl with two normal eyes wants to see full width of her face by a plane mirror.The eye to eye and ear to ear distances of her face at 4inch and 6inch respectively.The minimum width of the required mirror is ------------