P3, The eye 0.0 / 5 ? PhysicsLight and OpticsGCSEAQA Created by: emmajane_Created on: 17-05-14 15:37 What does the ciliary muscle in the eye do? Causes changes in the shape of the lens, which allows light to be focused at varying distances 1 of 8 What is being long sighted caused by? The eyeball being too shot, or the lens being unable to focus 2 of 8 What is being short sighted caused by? The eyeba;ll being too long, or the lens being unable to focus 3 of 8 What can eyes focus on, and specify them Between near and far points. Near= 25cm approx. far= Infinity 4 of 8 What is the film in he camera or the CCDs in a digital camera equivelant to? The retina in the eye 5 of 8 What is the power for a converging and diverging lens like? Converging= positive Diverging= negative 6 of 8 Which 2 things is the focal length of a lens determined by? 1. The refractive index from the material of which the lens is made 2. The curvature of the two surfaces of the lens 7 of 8 How does the refraction index compare to a lens? What does this mean? The greater the refraction index, the flatter the lens. Means the lens can be manuaftured thinner 8 of 8
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