Magnifying glass. Strained vision. The figure below shows a ray diagram of a simple magnifying lens. Lets’ consider first strained vision, i.e. assume that the image is at the near point N of the eye. a) On diagram (a) leaf is viewed through a magnifying glass. Where should you place the leaf to see the image at distance di = N (near point, 25cm)? Write down the expression for do in terms of
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Magnifying glass. Strained vision. The figure below shows a ray diagram of a simple
magnifying lens. Lets’ consider first strained vision, i.e. assume that the image is at the near
point N of the eye.
a) On diagram (a) leaf is viewed through a magnifying glass. Where should you place the leaf to
see the image at distance di = N (near point, 25cm)? Write down the expression for do in terms of
di and N
b) Determine its magnification M = θ / θ’ . Give your answer in terms of do and N (Hint: consider
relevant triangles)
c) Determine its magnification M = θ / θ’ in terms of the focal length f and N.
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