Question

A person has a $15cm$ wide face and his two eyes are separated by $9cm$. The minimum width of a mirror required for the person to view his complete face literally is

• A. $15cm$
• B. $9cm$
• C. $6cm$
• D. $3cm$

Answer 1

Answer: (D)

$3cm$

Width of the face, $D=15$ cm

Separation between eyes, $d=9$ cm

$\therefore$ Minimum width of mirror, $w=\frac{D-d}{2}=\frac{15-9}{2}=3$ cm