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Questions and Answers
Convex lenses cause light rays to diverge to a point.
False
Concave lenses are thicker in the middle than on the edges.
False
Plano-convex lenses are convex on both sides.
False
Bi-concave lenses are concave on both sides.
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Convex lenses are thinner in the middle than on the edges.
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Before the 1590s, simple lenses allowed high magnification.
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Zacharias Jansen and his father built only telescopes.
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Understanding the focal length of lenses was not important for combining their powers.
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The text mentions that simple eyeglasses were used before the 1590s.
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Bi-convex lenses are flat on one side and convex on the other.
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Concave lenses cause light rays to converge to a point.
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Convex and concave lenses come in the same configurations.
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A concavo-convex lens is also known as a positive (converging) meniscus lens.
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The focal length of a lens is the distance from the lens to the focal point.
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A concave lens converges parallel rays to a focal point with a positive focal length.
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A convexo-concave lens is commonly called a positive (converging) meniscus lens.
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A combined convex and concave lens is known as a negative (divergent) meniscus lens.
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Light rays traveling parallel to the optical axis of a concavo-convex lens will meet at the focal point.
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The image formed by a concavo-convex lens will be inverted relative to the actual image.
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A concavo-convex lens has a negative focal length and forms only virtual, smaller images.
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The focal length of a converging lens can be determined using a plane mirror and a graphical method.
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The intercept on the 1/V axis in the graph obtained using the graphical method represents the numerical value for which 1/U = 0.
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The mean value of the intercepts F1 and F2 in the graphical method gives the value of focal length F.
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The graph of 1/U against 1/V should produce a straight line through the points.
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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.
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Description
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.
