What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50 cm?
1) + 25 cm
2) – 25 cm
3) + 50 cm
4) – 50 cm
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What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50 cm?
1) + 25 cm
2) – 25 cm
3) + 50 cm
4) – 50 cm
3) + 50 cm