Trace two rays, both from far-distant objects, through a Protor photographic lens, one at altitude of 1 mm and the other at 5 mm. Determine where and at what angle the rays cross the optical axis. The specifications of this four-element lens, including an intermediate air space of 3 mm, are as follows, with distances in mm:
R1 = 17.5 | t1 = 2.9 | n1 = 1.6489 |
R2 = 5.8 | t2 = 1.3 | n2 = 1.6031 |
R3 = 18.6 | t3 = 3.0 | n3 = 1 |
R4 = −12.8 | t4 = 1.1 | n4 = 1.5154 |
R5 = 18.6 | t5 = 1.8 | n5 = 1.6112 |
R6 = −14.3 |
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