![How Focal Length Affects Viewing Angle | Digital Camera Know-Hows | Digital Camera | Digital AV | Support | Panasonic Global How Focal Length Affects Viewing Angle | Digital Camera Know-Hows | Digital Camera | Digital AV | Support | Panasonic Global](https://av.jpn.support.panasonic.com/support/global/cs/dsc/knowhow/common/img/l12/l12_01.jpg)
How Focal Length Affects Viewing Angle | Digital Camera Know-Hows | Digital Camera | Digital AV | Support | Panasonic Global
![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}} \\\\ $
![Figure(a) shows the basic structure of a human eye. Light refracts into the eye through the cornea and is then further redirected by a lens whose shape (and thus ability to focus Figure(a) shows the basic structure of a human eye. Light refracts into the eye through the cornea and is then further redirected by a lens whose shape (and thus ability to focus](https://haygot.s3.amazonaws.com/questions/1780567_e41b64923de94c67a79dbd4c353791db.jpg)
Figure(a) shows the basic structure of a human eye. Light refracts into the eye through the cornea and is then further redirected by a lens whose shape (and thus ability to focus
![A convex lens in a human eye adjusts its focal length based on the object position. If it can form a clear image on retina for objects as close as 25 cm A convex lens in a human eye adjusts its focal length based on the object position. If it can form a clear image on retina for objects as close as 25 cm](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1661885/original_Picture11.png)
A convex lens in a human eye adjusts its focal length based on the object position. If it can form a clear image on retina for objects as close as 25 cm
![The ciliary muscles of eye control the curvature of the lens in the eye and hence and alter the effective focal length of the system. When the muscles are fully relaxed, the The ciliary muscles of eye control the curvature of the lens in the eye and hence and alter the effective focal length of the system. When the muscles are fully relaxed, the](https://www.vedantu.com/question-sets/f300e9f2-752f-4309-a926-08ec91c4998e7645820946480710383.png)