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By Evans G. Valens

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I say estimate, because this technique is accurate only to within 5 to 10 percent of the refractive index. In Chapter 8, I will discuss a more accurate method to measure thickness using an interference microscope. The refractive index can be estimated from the following formula: n ϭ actual thickness/apparent thickness When a light ray travels from a medium with a higher refractive index to a medium with a lower refractive index it is possible for the angle of refraction to be greater than 90 degrees.

The cornea, which is composed of cells and extracellular fibrous protein, acts like a converging lens (Figure 2-39). 47. 336) and come to a focus on the photosensitive layer on our retina that contains color-sensitive cones used in bright light and light-sensitive rods used in dim light. The image on the retina is inverted. Neurons transmit signals related to the inverted image from the retina to the visual cortex of the brain. The brain then interprets the image and makes an effigy of the object that we see with the mind’s eye.

As the light rays reach the other side of the glass they will be bent away from the normal since they will be traveling from a medium with a higher refractive index to a medium with a lower refractive index. Thus, the light rays that travel through the thickest part of the glass will travel straight through since they make a zero degree angle with the normal. The imaginary line coincident with this ray is known as the principal axis. The rays that pass through the thinner part of the glass arrive at the glass–air interface at some angle to the normal.

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