Focal Length in Medical Physics

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Study Notes

• Before the 1590s, simple lenses were used for limited magnification and simple eyeglasses.
• Convex lenses, thicker in the middle than on the edges, cause light rays to converge to a point.
• Concave lenses, thicker on the edges than in the middle, cause light rays to diverge.
• Convex lenses have positive focal length, forming inverted images on the opposite side of the lens.
• Concave lenses have negative focal length, forming only virtual, smaller images on the same side of the lens as the object.
• Method for determining the focal length of a convex lens using a plane mirror and a graphical method.
• Apparatus includes a converging lens, holder, plane mirror, meter scale, mounted pin (object), and screen.
• Procedure involves obtaining a rough value for the focal length, measuring distances between object, lens, and image, and repeating with different object positions.
• Theory and calculation involves the equation 1/F = 1/U + 1/V, and finding the intercepts of the graph of 1/U against 1/V to find F1 and F2, then taking the mean value of F1 and F2 to find F.
• Results include distances, intercepts, and calculated focal length values.
• Conclusion is not explicitly stated in the text.

Explore the focal length of convex lenses in medical physics with this quiz. The quiz covers the introduction, method, discussion, and results related to the topic.

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