The human eye is a wonderful instrument, relying on refraction and lenses to form images. There are many similarities between the human eye and a camera, including:
a diaphragm to control the amount of light that gets through to the lens. This is the shutter in a camera, and the pupil, at the center of the iris, in the human eye.
a lens to focus the light and create an image. The image is real and inverted.
a method of sensing the image. In a camera, film is used to record the image; in the eye, the image is focused on the retina, and a system of rods and cones is the front end of an image-processing system that converts the image to electrical impulses and sends the information along the optic nerve to the brain.
The way the eye focuses light is interesting, because most of the refraction that takes place is not done by the lens itself, but by the aqueous humor, a liquid on top of the lens. Light is refracted when it comes into the eye by this liquid, refracted a little more by the lens, and then a bit more by the vitreous humor, the jelly-like substance that fills the space between the lens and the retina.
The lens is critical in forming a sharp image, however; this is one of the most amazing features of the human eye, that it can adjust so quickly when focusing objects at different distances.
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Primary sources are documents, images or artifacts that provide firsthand testimony or direct evidence concerning an historical topic under research investigation. ... The same document, or other piece of evidence, may be a primary source in one investigation and secondary in another.
Yes, one should make sure that the subjects and verbs agree
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The first sentence is a run on sentence (meaning it needs to be made into two or more sentences because it is too long.) I personally would fix this by, "...much more in common than most readers think. This is because both of these characters see and ......". Either that, or add some more commas to make it easier to read. Also, the texts need quotation marks around them. That's about it, it looks great besides that!
The answer is a. It's an adjective phrase because it helps describes the window.
