Question

In holography which of the following is/are recorded in photographic film?
A. Phase
B. Amplitude
C. Phase and amplitude
D. Frequency and amplitude

Answer 1

Normal light sources (sunlight or electric illumination) can be used to capture an image, but a laser is required to capture a hologram. With photography, a lens is used to capture the image, but in holography, the object's light is dispersed directly onto the recording medium.

Complete step-by-step solution:
A hologram is a recording of information about light that originated from the actual scene as spread in a variety of directions rather than coming from a single direction, as in a photograph. This allows the scene to be seen from a variety of perspectives, as if it were still there. A snapshot may be made with ordinary light sources, but a hologram requires the use of a laser. With photography, a lens is used to capture the image, but in holography, the object's light is dispersed directly onto the recording medium. A second light beam (the reference beam) must be focused onto the recording medium for holographic recording. Holography is a technique for capturing both the amplitude and phase information of a light wave as it passes through the film. The interference pattern created between the sample beam, which diffusely reflects from the object, and the reference beam, which is transmitted directly to the film, is recorded in the first stage. These two beams must be coherent and are usually created by dividing the beam of a single laser. The goal of this approach is to collect all of the information included in the sample beam's light waves as they arrive at the detector by employing the reference beam to store not just the amplitude but also the phase information. When the film is developed (the produced film is referred to as the hologram) and inspected directly by eye, it seems to be nothing more than a complicated interference pattern of light and dark bands in complicated forms, with no direct similarity to the actual items.
Hence option C is correct.

Note: A picture is a two-dimensional representation that can only duplicate a basic three-dimensional impression, but a hologram's recreated viewing range adds many more depth perception cues than the original scene. The human brain recognises these cues and converts them into the same three-dimensional visual experience as when the original scene was viewed.