A mirage is a result of atmospheric

Panorama made of 12 vertical shots stitched together Nikon D70 with 12-24mm f/4G ED-IF AF-S DX Nikkor @ 12mm, f/7.1, 1/60s With hand-held SB-800 on SC-29 cable, TTL|BL flash setting

Refractioncauses the bottom of a swimming pool to appear

The values for Field of View (FOV), sometimes sloppily referred to as "lens view" or better, "angle of view", come up frequently enough at the forums that I thought a list might be helpful for quick reference.

All waves will reflect and refract in the right circumstances. The reflection and refraction of light explains how people see images, colour and even optical illusions.

Magnification by a lens would be greater iflight

For a 55mm lens on a APS-C/DX sensor format body, the field of view would thus be 24.0 degrees horizontally, 16.1 degrees vertically and 28.7 degrees diagonally.

Stewart Godfrey (backtonikon64) on November 6, 2024 in A Visit to the Falkland Islands and the Antarctic Peninsula

Refractionoccurs whenlightpassingfromone medium to another

Please note, this is a table of rectilinear values, i.e. values for rectilinear lenses; fisheye field of view is a different beast.

To investigate the reflection of light by different types of surface, and the refraction of light by different substances.

How to use the table: Hopefully the table is quite self-explanatory, but let's say you are looking for the Field-of-view of a 50mm lens mounted on an FX body. In the column "Lens Focal Length", go down to the row marked "50mm" and then over to the green area marked "35mm & FX format (1)". The FOV for a 50mm lens would be 39.6 degrees horizontally and 27.0 degrees vertically. Diagonally, the FOV is 46.8 degrees.