![A multi-mode optical fiber with a large core diameter has a core refractive index ๐1 = 1.5](https://www.gkseries.com/blog/wp-content/uploads/2023/10/A-multi-mode-optical-fiber-with-a-large-core-diameter-has-a-core-refractive-index-๐1-1.5.jpg)
Q. A multi-mode optical fiber with a large core diameter has a core refractive index ๐1 = 1.5 and cladding refractive index ๐2 = 1.4142. The maximum value of ๐๐ด (in degrees) for which the incident light from air will be guided in the optical fiber is ยฑย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย .
![](https://www.gkseries.com/blog/wp-content/uploads/2023/10/image-36.png)
Ans: 29-31