The focal length of the convex lens will be determined by measuring the distance between the lens and the cardboard screen.

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True

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answer is A.

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Detailed Solution

The given statement is true .
Concept- We are aware that a convex lens is one in which light rays converge on a spot after being refracted by the lens. The focal length of a convex lens is the distance from the lens's center to the point at which light rays converge.
Let's first examine the method used to determine this focal length. As parallel light rays from infinity pass through the convex lens and are refracted, converging at a position known as the focal point, the focal length, which is measured from the center of the convex lens, is always positive for the convex lens.
The convex lens should first be placed on a holder on a bench table and held in front of a faraway object, such as a window or a tree. in order for light to readily pass through it. Place a cardboard screen just behind the lens at this point. We will now continuously adjust the distance of this cardboard screen until we locate the location where all of the object's rays concentrate. The focal length of the convex lens will be determined by measuring the distance between the lens and the cardboard screen.
Hence, the given statement is true.

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