What are their optical requirements and why are they often so large?
Presented by A. W. Trotter.
For Schools
Repeated on Tuesday at 4.15 p.m. and Wednesday at 10.0 a.m.
(to 10.43)
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What are their optical requirements and why are they often so large?
Presented by A. W. Trotter.
For Schools
Repeated on Tuesday at 4.15 p.m. and Wednesday at 10.0 a.m.
(to 10.43)