Salem Lutheran School Weather Forecast 7 day Outlook Light rain Monday, temperatures as high as 44Â°F / 7Â°C, low temperature around 39Â°F / 4Â°C, probability of precipitation 89%, wind out of the ESE 8 mph / 13 km/h.
Actually, the rule of thumb is to align your eyes (straight ahead) to about 3/4 up the height of viewable area of the screen. That is, about 1/4 of the screen is above eye-level, the rest is below and this should apply to any reasonable screen size.
Since the eyes are 174 cm from her feet, the point of incidence of this ray must be 174 cm/2 = 87 cm. This marks the lower edge of the mirror. So the lower edge of the mirror must be 87 cm from the ground and the vertical dimension of the mirror must be 177 cm - 87 cm = 90 cm, which is half the height of the person.