alleryOne dioptre is the power of a lens whose focal length is:
A1 metre
B1 minute
C1 micron
D1 mile
Answer & Solution
Correct answer: A. 1 metre
1. Focal length is expressed in metres here.
2. The power is its reciprocal.
3. The focal length is 1 metre.
_Source: syllabus Science, Ch 10 'Light - Reflection and Refraction'_
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