Hi friends,

Need a little help here . How do I solve these?

1. Find the vertical and horizontal prismatic effects produced by decentring the lens R-2.50DS / +5.00DC @135 12mm upwards.

Do I take x as 0 while using the formula method ?

How does it correlate while solving by the graphical method?

2. How much prism must be incorporated in the lens L-4.00 DS / -2.00 DC @ 140 in order to shift the optical centre 6mm inwards ?

Do both the problems incorporate the same concept? Pls pls kindly help

Rekha

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