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Optical characteristics are of great concern in photocatalytic applications, and photochemists have therefore gathered a good understanding of this approach to reveal their photochemical processes [61, 62]. These are based on the common law of Beer–Lambert and the basic principles of light [63]. These methods include information about the absorption, reflectance, luminescence, and phosphorescence of nanomaterials. Metallic and semiconductor NPs have various colours and are thus ideally suited for photo‐related applications. To understand each application's primary mechanism, it is often essential to see the importance of absorption and reflectance of these materials. UV–vis and photoluminescence are the most common optical devices used to study the optical properties of NP materials (PL, Null Ellipsometer). The Diffuse reflectance spectroscopy (DRS) UV/vis is a fully designed optical absorption, transmission, and reflection measurement unit. The first two are extra, while DRS is mostly a unique technique for the samples sold. It is imperative to use the method for measuring NP band gaps as well as other NPs. MMT, LaFeO₃, and LaFeO₃/MMT nanocomposite synthesis and differences in their absorption of electromagnetic radiation by UV–vis DRS to identify their optical characteristics were studied [64]. In the case of nanocomposites, a significant red shift was observed compared to pristine MMT and LaFeO₃ NPs. Instead of a broad absorption band from 400 to 620 nm, LaFeO₃ and LaFeO₃/MMT revealed a reduction in their band gap. These NPs are significant for photocatalysis by solar light [64]. To investigate the optical properties of photoactive NPs and other nanomaterials and UV, PL considers useful technologies. This technique gives further information on the absorption or emission potential of the materials and their effects on the picture's overall excitement period. It thus provides valuable details about the charging hybridization and half‐life of the exciting material on their conducting bands for all photo‐ and image applications.