The flashing red light falling into a black hole would appear to slow down and eventually stop as it approaches the event horizon. The light would also become increasingly redshifted, appearing redder and dimmer to an observer from a distance.
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The appearance of a flat horizon when viewed from a distance is caused by the curvature of the Earth.
The working distance of a stereo microscope refers to the distance between the objective lens and the specimen. A longer working distance allows for larger objects to be viewed, as there is more space between the lens and the specimen. Conversely, a shorter working distance limits the size of objects that can be viewed due to the physical constraints of the microscope's design.
The object distance in optical physics refers to the distance between the object being viewed and the lens or mirror that is used to form an image of the object. It is an important factor in determining the characteristics of the image formed by the optical system.
Working distance in a microscope refers to the distance between the objective lens and the specimen being viewed. It is important in microscopy because it determines the amount of space available for manipulation and focusing on the specimen. A longer working distance allows for more flexibility in sample handling and manipulation.
The image produced by a convex lens depends on the object distance, the focal length of the lens, and the type of object being viewed.