what should be the focal length while drawing a ray diagram.?.i.e.what should be the distance between focus and optical centre when we are drawing a ray diagram. It should always be the same?

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Solution

1. Focal length of a lens/mirror is the radius of the sphere of which the lens/mirror is part of.

2. Thus, while drawing ray diagrams, we take focal length as the distance between the point at which compass tip is kept and optical centre.

3. For a set of diagrams, focal length should be kept same.

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what should be the focal length while drawing a ray diagram.?.i.e.what should be the distance between focus and optical centre when we are drawing a ray diagram. It should always be the same?

1. Focal length of a lens/mirror is the radius of the sphere of which the lens/mirror is part of. 2. Thus, while drawing ray diagrams, we take focal length as the distance between the point at which compass tip is kept and optical centre. 3. For a set of diagrams, focal length should be kept same.