Question

how does the image distance (the distance from the lens to the focused image) change with the object distance (the distance from psy to the lens?)

Answer 1

The image distance (the distance from the lens to the focused image) change with the object distance (the distance from object to the lens) due to the lens formula.

Lens formula is defined as the relationship between object distance (u), image-distance (v) and the focal length (f). Following is the mathematical representation of lens formula:

Lens Formula : 1/f = 1/v - 1/u

Where f = focal length

           v = image distance

           u = object distance

• The lens is a transparent material which is bound by two surfaces. It has a principal axis, principal focus, centre of curvature of lens, aperture and optical centre.
• The images obtained from these lenses can be either a real image or a virtual image.

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