Answer
418.2k+ views
Hint: We are given two spheres whose centres of curvature are joined by a line. Now, we know that focal length is the distance between the focus and the centre of a lens and principal axis is a line joining the centres of curvature of the two spheres.
Complete step by step solution:
From the above question we can make a diagram.
Now, from the above diagram we can see that ${C_1}$ and \[{C_2}\] are the centre of the curvature of the two spheres respectively. Now, we know that centre of the distance between the centre of curvatures is known as optical centre, which is represented as $O$ . we also know that focal length is the distance of the centre of curvature to the focus of the lens and principal axis is the line joining the centres of curvatures of the two spheres.
Now, by taking the given options one by one,
Option A: we can see that option A says that the statement given in the problem is true. Now, the statement says that the imaginary line joining the centres of curvature of the two spheres, of which the lens is a part is known as Focal length (f). But, we have discussed above that the line joining the centres of curvature of the two spheres is known as principal axis. Hence, this option is incorrect. Which means that the statement given above is false.
Option B: As we have discussed above that the statement given in the problem is false. So, this is the correct option.
Hence, the correct option is B.
Note: We know that the principal axis is a line passing through the centre of the curvatures of the spheres and through the centre of the surfaces of the spheres. So, principle axis and focal length are the two different quantities.
Complete step by step solution:
From the above question we can make a diagram.
![seo images](https://www.vedantu.com/question-sets/056aee56-6e3c-4cd2-8669-670b472388872532449774967319582.png)
Now, from the above diagram we can see that ${C_1}$ and \[{C_2}\] are the centre of the curvature of the two spheres respectively. Now, we know that centre of the distance between the centre of curvatures is known as optical centre, which is represented as $O$ . we also know that focal length is the distance of the centre of curvature to the focus of the lens and principal axis is the line joining the centres of curvatures of the two spheres.
Now, by taking the given options one by one,
Option A: we can see that option A says that the statement given in the problem is true. Now, the statement says that the imaginary line joining the centres of curvature of the two spheres, of which the lens is a part is known as Focal length (f). But, we have discussed above that the line joining the centres of curvature of the two spheres is known as principal axis. Hence, this option is incorrect. Which means that the statement given above is false.
Option B: As we have discussed above that the statement given in the problem is false. So, this is the correct option.
Hence, the correct option is B.
Note: We know that the principal axis is a line passing through the centre of the curvatures of the spheres and through the centre of the surfaces of the spheres. So, principle axis and focal length are the two different quantities.
Recently Updated Pages
Mark and label the given geoinformation on the outline class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
When people say No pun intended what does that mea class 8 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Name the states which share their boundary with Indias class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give an account of the Northern Plains of India class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Advantages and disadvantages of science
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Bimbisara was the founder of dynasty A Nanda B Haryanka class 6 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
10 examples of evaporation in daily life with explanations
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
How do you graph the function fx 4x class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)