Civil Engineering - Surveying - Discussion


Diopter is the power of a lens having a focal length of

[A]. 25 cm
[B]. 50 cm
[C]. 75 cm
[D]. 100 cm
[E]. 125 cm

Answer: Option D


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)  

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.

1/metres For example, a 3-dioptre 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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