Dark85's latest activity
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DYes, that's more or less it: conformal time would be equivalent to the time in the last 46.5 billion years of a static universe, as...
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DI don't see how this affects what I proposed. However, if you look at the bottom panel of Figure 1 in Davis & Lineweaver (which is where...
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DThe point is that the scale factor of the universe is time varying in a non-trivial manner. Sometimes maths is easier if we move that...
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DSee figure 1 in Taylor and Lineweaver, which is a distance-vs-time chart of the universe. The top chart has a horizontal scale in...
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DPlease stop and think about what "expansion" means. The galaxies at the edge of our observable universe emitted the light that we now...
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DThe wikipedia pages for the Particle horizon of the universe has the following statement: "Due to the expansion of the universe, it is...
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DDark85 reacted to DaveC426913's post in the thread Is this an oversimplification? (treating a lens as a set of prisms) with
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Again, it seems to achieve its goal quite well. I don't really understand what the objection is. Three prisms is sufficient to prove... -
DDark85 reacted to kuruman's post in the thread Is this an oversimplification? (treating a lens as a set of prisms) with Like.
The diagram is misleading and works if only three rays were incident on the gadget. I think it's a bad way to present the subject.
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DDark85 reacted to Ibix's post in the thread Is this an oversimplification? (treating a lens as a set of prisms) with Like.
I think the message the book is trying to convey is that lenses work on the same principles of refraction that prisms do, and that the...
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DDark85 replied to the thread Is this an oversimplification? (treating a lens as a set of prisms).I see... well thinking about it, I guess the reason I asked that question was because I was kinda annoyed with the number of...
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DMy learning is a bit rusty. I can intuit the answer but I can't formalize it. What does the scale read? I say the scale reads 10kg...
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DDark85 replied to the thread Is this an oversimplification? (treating a lens as a set of prisms).Okay it may be so, but I felt using 3 prisms to approximate a lens is not so accurate...
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DDark85 replied to the thread Is this an oversimplification? (treating a lens as a set of prisms).The goal is to construct the ray diagrams for 3 parallel rays passing through a convex lens and to show that they converge at the focus.
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DDark85 posted the thread Is this an oversimplification? (treating a lens as a set of prisms) in Introductory Physics Homework Help.So in my textbook, it is stated that "The refraction of light through a lens can be understood in a simple way by considering a lens as...
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DIn answer to your question, the Planck length, as far as I know, is defined to be: $$l_p = \sqrt{\frac{\hbar G}{c^3}}$$I think it's...
