In an experiment to measure the focal length ( f ) of a convex lens, the magnitude of object distance ( x ) and the image distance ( y ) are measured with reference to the focal point of the lens. The y - x plot is shown in figure. The foca

Question

In an experiment to measure the focal length ( f ) of a convex lens, the magnitude of object distance ( x ) and the image distance ( y ) are measured with reference to the focal point of the lens. The y - x plot is shown in figure. The focal length of the lens is _ _ _ _ _ cm .

Quantrex Academy · Accepted Answer

Correct answer: 20

From Newton's formula for lens, we can write x 1 x 2 = f 2 ⇒ 20 × 20 = f 2 Therefore, f = 20 cm

In an experiment to measure the focal length ( f ) of a convex lens, the magnitude of object distance ( x ) and the image distance ( y ) are measured with reference to the focal point of the lens. The y - x plot is shown in figure. The focal length of the lens is _ _ _ _ _ cm .

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