Discussion :: Surveying  Section 1 (Q.No.17)
17.  Diopter is the power of a lens having a focal length of 

Answer: Option D Explanation: No answer description available for this question.

Ajay Pandey said: (Oct 15, 2013)  
1 diopter equal 100 c.m. 
Rohit Sharma said: (Jul 26, 2014)  
Its equal to 1 meter or you can say 100 c.m. 
Abhisheks said: (Dec 29, 2014)  
1D = 1/f, where f = 100 cm or 1 m. 
Sharad Sethi said: (Feb 19, 2016)  
Then what is relationship between diopter and 25 cm? 
Monika said: (Jul 30, 2016)  
Then the answer is 1/100. How the answer will be 100. 
Mani said: (Aug 16, 2016)  
Diopter means? 
Bhavesh Prajapati said: (Sep 27, 2016)  
What you mean by Diopter? 
Amit Ami Sharma said: (Dec 15, 2016)  
@Mani & @Bhavesh. Diopter is a unit of power of lens. 
Abhishek Anand said: (Feb 11, 2017)  
@Monika. Value of 1/f =1/100. So f=100. 
Er Meghanada (Bhadrak.Odisha) said: (Nov 17, 2017)  
@Mani & @ Bhavesh prajapat _Said What is Means Diopter: > A dioptre (uk), or diopter (us), is a unit of measurement of the optical power of a lens or curved mirror, > which is equal to the reciprocal of the focal length measured in metres. Slove: 1/metres For example, a 3dioptre lens brings parallel rays of light to focus at 1/3 metre. (Right Answer 1 Diopter egual 100 cm or 1 m.) 
Er Meghanada (Bhadrak.Odisha) said: (Nov 17, 2017)  
Chromatic Aberration ? : >For Single Lenses the focal length of blue light will be slightly shorter than that for red light is know as Chromatic aberration, Spherical Aberration: >In Real Spherical lenses these outer rays do not focus at exactly the same point because of spherical aberration, F = Focal Length , P = 1/F power lenses. 1 diopter equal 100 c.m./1 m. 
Rixu said: (May 12, 2019)  
@Sharad Sethi. 25 is the minimum sight distance to see an object clearly, don't get confused here with diopter. 
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