If Keziah stands on top of a hill at sunrise, looking eastward where the sun is rising, and Irina stands at the bottom of the hill facing westward towards Keziah, can Irina see Keziah's face clearly? Respond very briefly.
Irina cannot see Keziah's face clearly. Since Keziah is facing east, towards the sunrise, and Irina is facing westward towards Keziah, the sunlight will be illuminating the back of Keziah's head and casting her face in shadow from Irina's perspective. Additionally, the brightness of the rising sun behind Keziah can cause further glare, making it difficult for Irina to see Keziah's features. Therefore, the direction of the sunlight and the relative positions of Keziah and Irina mean that Keziah's face will be obscured due to backlighting.