To solve this problem, we need to identify the components that make up the photosensitive compound in the human eye.$\newline$The photosensitive compound in the human eye is known as rhodopsin, which is found in the rod cells of the retina.$\newline$Rhodopsin is composed of two main components:$\newline \bullet$Opsin: This is a protein that forms the structure of rhodopsin.$\newline \bullet$Retinal: This is a derivative of vitamin A and acts as the light-absorbing molecule.$\newline$When light hits rhodopsin, retinal changes its configuration, leading to a series of biochemical events that result in a nerve impulse being sent to the brain.$\newline$Now, let's evaluate the options:$\newline \bullet$Option 1: Guanosine and retinol.$\newline$ - Guanosine is a nucleoside, not involved in the photosensitive compound.$\newline$ - Retinol is a form of vitamin A, but it is not directly part of rhodopsin.$\newline \bullet$Option 2: Opsin and retinal.$\newline$ - This option correctly identifies the components of rhodopsin.$\newline \bullet$Option 3: Opsin and retinol.$\newline$ - Retinol is not the correct form involved in rhodopsin; it should be retinal.$\newline \bullet$Option 4: Transducin and retinene.$\newline$ - Transducin is a protein involved in the phototransduction pathway, not a component of rhodopsin.$\newline$ - Retinene is an older term for retinal, but transducin is not part of the photosensitive compound.$\newline$Therefore, the correct answer is Option 2: Opsin and retinal.