Saved Bookmarks
| 1. |
Define principal axis, principal focus and focal length of a convex lens. |
|
Answer» Principle axis: The principal axis of a lens is a line passing throught the optical centre of the lens and perpendicular to both the faces of the lens. Principle focus: The principal focus of a convex lens is a point on its principal axis to which light rays parallel to the principal axis converge after passing through the lens. Focal length: The distance of the principle focus from the optical center of a lens is called its focal length. |
|