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Light Reflection and Refraction
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16/08/2021 12:36 pm
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(a) Explain with the help of a diagram, why the convex lens is also called a converging lens.
(b) Define principal axis, principal focus and focal length of a convex lens.
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16/08/2021 12:40 pm
(a) A convex lens also known as converging type because it converges a parallel beam of light rays passing through it.
(b) Principle axis: The principal axis of a lens is a line passing through 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.