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Science

Define 1 dioptre of power of a lens.

Refraction Lens

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Answer

1 dioptre is the the power of a lens whose focal length is 1 metre.
1D = 1m^-1

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Related Questions

You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 9.3.
S.
No. Material Medium Refractive Index
1. Air 1.0003
2. Ice 1.31
3. Water 1.33
4. Alcohol 1.36
5. Kerosene 1.44
6. Fused quartz 1.46
7. Turpentine oil 1.47
8. Benzene 1.50
9. Crown glass 1.52
10. Canada Balsam 1.53
11. Rock salt 1.54
12. Carbon disulphide 1.63
13. Dense flint glass 1.65
14. Ruby 1.71
15. Sapphire 1.77
16. Diamond 2.42