A woman fixing her hair holds a plane mirror 30 cm away from the 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. Approximately how far does the image of the back of her head appear in front of her?
4 answers
240 cm
210 because 2 pane mirrors are parallel to each other and we have to find the distance between the image of back head in the wall mirror and and the
infront mirror
infront mirror
+30 because they are asking from the object
240cm.
The ray of light reflected from her head travels 90cm to the mirror on the bathroom wall, and the ray of light travels 120cm (90+30) back to the mirror in front of her before travelling into her eyes 30cm away from the mirror.
=>90 + 120 + 30 = 240cm.
Gracias.
The ray of light reflected from her head travels 90cm to the mirror on the bathroom wall, and the ray of light travels 120cm (90+30) back to the mirror in front of her before travelling into her eyes 30cm away from the mirror.
=>90 + 120 + 30 = 240cm.
Gracias.
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