Eyeglasses and camera lenses change the path of light to focus an image. Which of the following is responsible for that change?

1. Refraction

   Yes! Refraction bends light as it moves from one substance to another. By bending the light, we can use refraction to focus the image in a camera, or to correct the focus of the lens in our eyes.

2. Reflection

   No. While some light is reflected from a lens, that does not help us focus the image.

3. Absorption

   No. The lens is clear, telling us that very little of the light is being absorbed. Absorption does not help the lens focus.

4. Diffusion

   No. Diffusion is the scattering of light as it is reflected in many different directions. Diffusion would make the image cloudy and blurry, not help focus it.

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