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Define concave lens, convex lens, optical density and refraction

Define concave lens, convex lens, optical density and refraction
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2. asked by Mark Nobeh
3. 46 views
1)Which of the following objects can set fire to a piece of paper in the presence of sunlight?A)doulble concave lens B)convex
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2. asked by Jon
3. 2,259 views
A bi-convex lens with the focal length of 25 cm and a meniscus concave lens with the focal length of 10 cm, separated from each
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2. asked by Me
3. 249 views
What type of lens is thicker in the center than at the edges?a reflecting lens a virtual lens a concave lens a convex lens
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2. asked by mir
3. 161 views
1) A convex lens with a focal lenght of 4.0cm is placed 20.0cm from a concave lens with a focal lenght of 5.0cm. Find the
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2. asked by Anonymous
3. 1,270 views
Convex and Concave LensesA lens is an object with a curved surface or surfaces. The curves help to bend visible light, which
1. 1 answer
2. 12 views
3) Find out the Focal length for the following lenses (in all cases, the lens is made of a glass with index of 1.5):a) Bi-convex
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2. asked by Me
3. 258 views
Because a concave lens cannot form a real image of a real object, it is difficult to measure its focal length precisely. One
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2. asked by Ted
3. 1,279 views
Convex and Concave LensesConvex and Concave Lenses A lens is an object with a curved surface or surfaces. The curves help to
1. 1 answer
2. 14 views
You have a converging (convex) lens and a diverging (concave) lens and the magnitude of the focal length of each lens is 38.5
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2. asked by Drew
3. 1,554 views