![Which part of the human eye controls the focus of the eye by varying its thickness? A.Ciliary muscles B.Iris C.Pupil D.Retina Which part of the human eye controls the focus of the eye by varying its thickness? A.Ciliary muscles B.Iris C.Pupil D.Retina](https://www.vedantu.com/question-sets/1350086d-3f12-4bb7-840c-d779a907b5877459014746314103569.png)
Which part of the human eye controls the focus of the eye by varying its thickness? A.Ciliary muscles B.Iris C.Pupil D.Retina
![The focal length of a normal eye-lens is about:$(a){\\text{ 1mm}} \\\\(b){\\text{ 2cm}} \\\\(c){\\text{ 25cm}} \\\\(d){\\text{ 1m}} \\\\ $ The focal length of a normal eye-lens is about:$(a){\\text{ 1mm}} \\\\(b){\\text{ 2cm}} \\\\(c){\\text{ 25cm}} \\\\(d){\\text{ 1m}} \\\\ $](https://www.vedantu.com/question-sets/23766a8b-704b-4a02-9898-45078c04e63b6462374204689754885.png)
The focal length of a normal eye-lens is about:$(a){\\text{ 1mm}} \\\\(b){\\text{ 2cm}} \\\\(c){\\text{ 25cm}} \\\\(d){\\text{ 1m}} \\\\ $
![SOLVED: Image before (in-front) Retina Retina Long distance Object Coft Uaeaaug Human Eye Lens The above picture shows the defect of human eye; where the image of the long distance object is SOLVED: Image before (in-front) Retina Retina Long distance Object Coft Uaeaaug Human Eye Lens The above picture shows the defect of human eye; where the image of the long distance object is](https://cdn.numerade.com/ask_images/3a62f322ae1245a1abdb57e2cef9c227.jpg)