How do you calculate maximum and minimum focal length of eye lens
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The minimum focal length of eye lens is 2.27 cm.
- The distance between lens and retina is 2.5cm.
- Image is formed at retina.
- Hence, image distance for eye lens(v) = 2.5cm.
Maximum focal length:
- For maximum focal length, object is at infinity.
- Hence, in this case u = - ∞, v = 2.5 cm, = ?
- Substituting above values in (1)
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