can you explain the focal length of a telescope with a diagram in both refracting and reflecting telescope
can you explain the focal length of a telescope with a diagram in both refracting and reflecting telescope
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LENSES
Light normally moves in straight lines, but there are situations in which this is not true. You are already familiar with some: for example, the distortions you see looking through the surface of the ocean occur because light bends as it passes from the water into the air. Long before we understood why light bends as it passes from one transparent material to another, people had used this effect to create lenses: optical devices which can gather light together or spread it apart.