Optics (refraction) problem. a ray of sunlight traveling through the atmosphere enters a completely filled, wide, rectangular pond having vertical sides. the light arrives at the eastern edge of the pond at an angle of θ 75 degrees from a normal (perpendicular) drawn to the pond's surface, and continues until it strikes the bottom. assuming the pond contains water, and the depth of the pond is 12m, how far from the eastern edge of the pond will the light strike the bottom of the pond? 5. optics (lens) problem. a lens forms an image of an object. the object is 16.0cm from the lens. the image is 12cm from the lens on the same side as the object. a. what is the focal length of the lens? is the lens converging or diverging? b. if the object is 8.5mm tall, how tall is the image? is it erect or inverted? c. draw a principal ray diagram