Explanation

A Camera Lucida is an optical device used as an aid for artists.

It allowing them to trace images projected onto a surface.

It helping them to accurately sketch and draw what they see.

It was invented by William Hyde Wollaston in 1806.

Explanation

The Camera Obscura, a precursor to the modern camera, was first described by the Chinese philosopher Mozi in 400 BC.

It was a device that projected an inverted image of the outside world onto a surface, using a small hole or lens.

This principle was later developed into the modern camera.

Explanation

Visible light, which is perceived by the human eye, falls within the range of 4000 to 7000 angstroms (Å).

This range corresponds to the colors of the visible spectrum, from violet (4000 Å) to red (7000 Å).

Explanation

A "bleeding" picture refers to a print where the image extends to the edges of the paper, without any borders or margins.

This is often achieved by printing the image larger than the paper size.

It allowing the image to "bleed" off the edges.

Explanation

Infra-red rays are used in long distance photography.

It is used particularly in surveillance and military applications.

As they can be used to capture images through fog, smoke, and other obscurants.

It is also used in low light conditions.

This type of photography is also known as "thermal imaging".

Explanation

Documentary photography is a genre of photography that aims to document and inform about social, political, and economic issues.

It often used to raise awareness and spark change.

Explanation

In photography, the foreground refers to the area in front of the subject.

In between the camera and the main object of interest.

It is often used to add depth and context to an image.

Explanation

Focal length is the distance between the film (or sensor) and the optical center of the lens.

It is measured in millimeters (mm).

It determines the angle of view, magnification, and perspective of an image.

Explanation

Flat lighting refers to a lighting setup that produces a minimal amount of contrast.

It resulting in a evenly lit image with minimal shadows and highlights.

It often used to capture details and textures.

Explanation

In photography, a filter is a colored piece of glass or plastic.

It is placed over the lens to modify the light entering the camera.

It is used to correct color casts, enhance colors, or achieve special effects.