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he ratio of the size of the image to the size of the object is known as:
(A) the focal plane
(B) the transformation ratio
(C) the efficiency
(D) the magnification ratio

Last updated date: 29th May 2024
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Hint: We know that the focal plane is a plane perpendicular to the principal axis and passes through the focal point. It is the plane where parallel rays but not parallel to the principal axis converge at or appear to diverge from after reflection. Focal length f- it is the distance between the pole of the mirror and its focal point. A Front Focal Plane optic is ideal for a shooting style that we'll call “hold-off” and is popular among long-range shooters. The concept is simple: it is formed to hold high for elevation and hold left or right to compensate for wind, using your Mil or MOA reticle appropriately.

Complete step by step answer
The focal plane is the distance between your camera lens and the perfect point of focus in an image. This area is located a certain distance in front of your camera lens, and spans horizontally, left to right across our frame. The focal plane mark is the point from which distance is measured for various focus calculations. However, the focal plane is found inside the camera. It is this mark, on the outside of the camera body, that identifies the location of the focal plane surface inside the camera.
An imaginary plane perpendicular to the principal focal point is called the focal plane of the lens system. As light rays pass through an objective, they are restricted by the rear aperture or exit pupil of the objective.
Ratio of the size of the image to the size of the object is known as magnification. It is given by $\mathrm{m}=\mathrm{v} / \mathrm{u}$.

So, the correct answer is option D.

Note: We know that magnification ratio” is a technical term in photography. Such ratios are based on size comparisons between real-life subjects and how they are captured on film. In reality, a magnification ratio ungainly as it sounds measures the photographer's desire to see the object as it truly is. Magnification, in optics, the size of an image relative to the size of the object creating it. Linear (sometimes called lateral or transverse) magnification refers to the ratio of image length to object length measured in planes that are perpendicular to the optical axis. Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a calculated number also called "magnification". When this number is less than one, it refers to a reduction in size, sometimes called minification or de-magnification.