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41 questions
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Can anyone tell me how can draw shadow of black hole like in presented in Intersteller movie? Is there any code for it in Mathematica or in Python? [closed]

Equation of motion for photon $$\Sigma \frac{dt}{d\lambda} = aL\left(1-\frac{r^2+a^2}{\Delta}\right) + \omega\left(\frac{\left(r^2+a^2\right)^2}{\Delta}-a^2 \sin ^2\theta\right)\ ,$$  \Sigma\frac{...
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If the Sun moves across the ground at 0.25 nautical miles per second, why do shadows move very much slower? [closed]

This title has been discussed previously on this site here. Question: Shadows from the sun moves fairly slow across the ground. Maybe a centimeter per sec. however, I calculated that the sun is ...
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why shadow of a glass oscillates under the rotating fan behind which there is a lightsource

So today I was sitting in mess, and light coming to me was fluctuating mainly because of rotating fan which was cutting the light source just right above it. But then i observed that the shadow of the ...
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Horizontals in a grid do not cast shadow while verticals do. Why is this?

A friend shared this image and asked about the shadow. As it appears the horizontals are not casting a shadow while the verticals are. It seems that the light source is on the left hand side wall, ...
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I had a oil burning candle in a dark room and noticed a small shadow on the ceiling directly above the flame. Its as though the candle throws light outwards in every direction except straight up. I'...
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I have read about schlieren photography which uses the ability of non-uniform air to create shadows. Is it really possible that air makes shadows?
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Consider the following Diagram : By Huygen's Principle, we know every point on a Wavefront acts as a Secondary point source and emits light (wavelets in all direction). Let us consider a Wavefront ...
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Yesterday, while warming water in a steel bucket for taking a bath, I observed something. When I made a whirlpool with the help of my rod heater, I observed that after stabilizing, the whirlpool ...
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I had always thought anything below third dimensions couldn't exist in our 3rd-dimensional world. Correct me if I'm wrong but anything 0d 1d or 2d is massless and also can't have energy so it just can'...
731 views

Why don't flying birds have shadows?

I saw a flock of birds flying around today, and noticed that they didn't cast any shadows on the ground. I thought this to be rather strange, so I tried to resolve this mystery. My first idea was ...
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I have a question about color and light

I've been thinking, imagine you have a room, a light bulb at the top and you hold your hand up off the ground. Of course, there will be a shadow under your hand and no light will have access to that ...
47 views

Expansion of sunlight

I have very little background in physics so any help would be appreciated: Assuming the sun is directly overhead (like at the equater during an Equinox), and I attempt to cast a shadow on the ground ...
3k views

Super Fast Message [duplicate]

It is known that a shadow can travel faster than the speed of light and break no known laws of physics, because it is not an actual thing. A shadow is just the blockage of light. However in the ...
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Does a spark cast a shadow? [duplicate]

Does an electrical spark / arc cast a shadow? For example, if you shine a flashlight through the sparks generated through a tazer, will it cast a shadow on the wall? Unfortunately I don't have a ...
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What are ShadowBands during SolarEclipse and how can it be reproduced?

I recently got to know about different phases of a solar eclipse and its impact on Earth and its living creatures.., but one of the most interesting and not well explained phenomenon is the ...
7k views

Can a shadow move faster than the speed of light? [duplicate]

I'm just a layman with no real science background (a) I'm not really sure what a shadow is. Some people are saying that it's the absence of something (a photon?) and therefore it is not subject to ...
659 views

What causes the dark bands in water wave ripples? [duplicate]

I was filling the bathtub the other day with water and noticed something. When calm, the light illuminates everything and I can see the sides and bottom of the white tub without shadows. Then, when I ...
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Shadows and the path of photons? [duplicate]

Why does shadows reflection got these blurry edges , is it something related to quantum physics , how photon travels to make these outlines look like this? Does the uncertainty principle plays role ...
655 views

Why is the moon not full?

Was out running this morning and noticed the both the sun and the moon in the sky. The part that has me stumped is that both the sun and the moon were up at around 60 degrees relative to the horizon ...
32 views

Explanation of a match between shadows and wet floor at Niagara Falls

The question is about the cause of a wet-floor phenomenon. My vacation trip started at Niagara Falls (Canadian side, horseshoe fall on the upper left corner). It was around 10-11 AM, not too sunny yet....
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What is this shadow being cast upon?

The picture below is from on top of Mt. Shasta at sunrise. The sun was directly behind me when I took the picture and it appears to be casting a shadow on.... the sky itself? Can anyone explain ...
4k views

Why does light act differently in miniatures?

When painting miniatures (like RPG fantasy miniature soldiers)... why is it necessary to paint lights and shadows? Being a 3D object, shouldn't the natural light be enough to create lights and ...
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Would a black hole cast a shadow? [duplicate]

Okay, so I've been wondering and this is a simple question and I cannot find an answer anywhere. Would a blackhole the size of the Moon (event horizon) black out the Sun in a "Lunar eclipse"? My ...
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Does this shadow diffraction effect have a name?

I noticed a cool diffraction effect today as I was sitting outside in bright sunshine: Suppose you have a fixed edge casting a shadow. If you put your hand on the side of the edge nearer to the ...
544 views

Why is my shadow deformed and not the shadow of the ceiling? [duplicate]

Look at these two photos of my shadow from sunlight. Case 1: My shadow is separated from the shadow of the ceiling and my head is round. Case 2: But when I walk a little more and the shadow of my ...
558 views

Is single tree shadow locally affecting air temperature?

In other words, is the air temperature under a single tree different from a couple meters away, in a hot day and under the sun? There are several effects potentially interacting: Tree transpiration ...
3k views

What determines the sharpness of a shadow?

What are the factors that affect the sharpness of a shadow? I would think that the distance between the light source and the object, the distance between the object and the shadow, and the size of ...
2k views

why shadows become dark when light intensity increases? [closed]

I observed following phenomena today: in my room with some lightings, there is a stuff toy placed in front of a wall. The ambient lighting doesn't cause any shadow on the wall currently. Scene 1: ...
231 views

Optics of perceived shadows on LCD monitor

After changing my desktop wallpaper on my LED-lit LCD monitor to one with a dark corner, I started seeing shadows on where the clock widget is while looking sideways at the screen. These shadows move ...
121 views

Image formation or Diffraction?

I was watching this video on the YouTube channel Veritasium. In this episode, the host shows people paper containing holes of different shapes in the middle. So there is a paper which has a hole in ...
1k views

Why is the shadow of a wind turbine a bit slow at first then very quickly, etc. and not equivalent to the wings?

When I stand at a wind turbine and look at the shadow on the ground, the shadow is a bit slow at first then very quickly, etc. Very strange.
209 views

Seeing the shadow of a black hole

Why can't we see the shadow of a black hole cast on Earth. Shouldn't the black hole block some light from a star or a galaxy far behind as they line up?
78 views

Can the term «shadow» pertain to anything else than light? [closed]

Can the term shadow pertain to anything else than light? Feel free to interpret this question in the widest sense possible.
912 views

A light so strong it has a shadow

I have recently taken an interest in shadows. I know that in order for a shadow to exist that you must have a solid in the way of the light. My hypothesis is that there can be a light so strong, like ...
12k views

Now this might be a silly question but it's actually bugging me, this one might be easier to understand if you have kids that watch (or used to watch) Peppa Pig. In one of the episodes, about shadows, ...
8k views

Can the sun cast a shadow?

The sun's light can cast the shadow of another object, but does it ever cast its own shadow?
1k views

Sorry if this is the wrong place to post this but it seemed the most appropriate. I read a riddle earlier today that mentioned something about shadows underwater and it got me thinking.. Would a ...
598 views

Why does the point of intersection of two shadows look brighter?

When I sit in my garden during the day I always keep looking at the two intersecting shadows of two rods. It looks something like this: What I find weird about it is that at the point of ...