Fig. 90. which CB cuts the axis. Produce the incident ray to meet CB in R.Join EF, then RF is the refracted ray. For a double concave lens takea plane BAG perpendicular to the axis and passing through the opticalcentre and proceed in the same way. 75. To find the image of a point formed by… … Fig. 91. to T. A ray incident along PA emerges in the same straightline along AT. Draw PR parallel to the axis to meet theline BAG through the optical centre in R. Join FR andproduce it to S. A ray incident along PR is refracted alongRS; let FR and PA meet in p. The two emergent rays ATand RS…
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