6. IE •• A woman fixing the hair on the back of her head holds a plane mirror 30 cm in front of her face so as to look into a plane mirror on the bathroom wall behind her. She is 90 cm from the wall mirror.

(a) The image of the back of her head will be from (1) only the front mirror, (2) only the wall mirror, or (3) both mirrors.

(b) Approximately how far does the image of the back of her head appear in front of her?