Depending on the circuit, backwards may not hurt it a bit, but then it might also turn into a DED (Dark Emitting Diode).

LEDpolarity marking on PCB

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For through-hole LEDs, the flat side usually also corresponds to the shorter of the two legs of the part. This is the cathode, or negative side.

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LEDanode cathode diagram

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And the only reason LEDs would explode violently when soldered in backwards is if there's no resistor in series with it - that keeps the current restricted on the device, which in turn keeps it alive.

In this image a medium depth of field allows the viewer to focus on multiple subjects without creating confusion for your eyes Photo by Sebastian J. Sciotti Jr. In this image a medium depth of field allows the viewer to focus on multiple subjects without creating confusion for your eyes Download Image  Share Image: X Facebook Email Photo by: Sebastian J. Sciotti Jr. VIRIN: 170525-D-SS007-019C

LEDpositive negative symbol

The following graphic illustrates how changing these factors: aperture, focal length and the distance from the subject affect the depth of field.

Depth of field (DoF) is the area between the nearest and farthest points from the camera that are acceptably sharp in an image. A deep DoF means all or most of your photo will be in focus, including the foreground, subject and background. Use a deep DoF in group photos, landscape shots and when elements in the background or foreground add to the message the photo is attempting to communicate. A shallow DoF means more narrow range will be acceptably sharp in the image. Shallow DoF is good to use when you want to isolate your subject from their surroundings, such as in a portrait or when elements in the background or foreground may be distracting.

LEDsymbol

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Most LEDs I've worked with also came with a leg shorter than the other. After you determine which leg is on the flat side you don't have to keep eye-balling them to put them in correctly.

The focal length of the lens determines the image magnification. The wider the lens, the shorter the focal length. This allows you to capture a wider depth of field. The longer or more zoomed in the camera lens, the less depth of field you capture.

SMDLEDpolarity marking on PCB

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In this image a deep depth of field allows the viewer to take in many subjects, including an artillery shell mid-flight. Photo by Staff Sgt. Steven Schneider In this image a deep depth of field allows the viewer to take in many subjects, including an artillery shell mid-flight. Download Image  Share Image: X Facebook Email Photo by: Staff Sgt. Steven Schneider VIRIN: 170918-O-N0132-7230C

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LEDs (like all diodes) have an anode and a cathode, which must be oriented correctly in the circuit. When you look at an LED from the top, it won't be circular - there's a flat side. Usually the silk-screening on the PCB indicates where the flat side should go, and thus the orientation of the anode & cathode.

The aperture is the opening created by a set of overlapping metal blades, known as the diaphragm, inside a photographic lens. This opening controls the amount of light coming through the lens. The wider the aperture, the less depth of field you capture. The smaller the aperture, the deeper the depth of field.

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That's often the first stage in learning. At least you had a theory. Those without any theories (even wrong ones) will never progress in their knowledge.

In this image you can see how a shallow depth of field keeps the focus on the action. Photo by Samuel King In this image you can see how a shallow depth of field keeps the focus on the action. Download Image  Share Image: X Facebook Email Photo by: Samuel King VIRIN: 170908-F-OC707-0517C

How to identify positive and negative terminal ofLED

I just looked at my (lonely, neglected, & unstuffed) x0xb0x PCB - the screening does indicate the flat sides, so just line 'em up accordingly.

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Infographic illustrates how changing the aperture, the focal length and the distance from the subject affect the depth of field. Download Image  Share Image: X Facebook Email Photo by: DINFOS PAVILION Team VIRIN: 200907-D-PA656-0002

LEDsymbol circuit

For through-hole LEDs, the flat side usually also corresponds to the shorter of the two legs of the part. This is the cathode, or negative side.

You can affect the depth of field by changing the following factors: aperture, the focal length and the distance from the subject.

Distance to subject refers to the length between the camera and the focus of the image. The closer the camera is to the subject it is focusing on, the narrower the depth of field will be. Inversely, the farther away the subject is from the camera, the wider the depth of field will be.

And the only reason LEDs would explode violently when soldered in backwards is if there's no resistor in series with it - that keeps the current restricted on the device, which in turn keeps it alive.