How to find focal length of diverging lens

Between the two lenses the light appears to diverge from a point X distance f to the left of the first lens. For a thin double convex lens refraction acts to focus all parallel rays to a point referred to as the principal focal point. Determine the image distance the magnification of the image the image height and properties of the image. In the image illustrated above we obtain focused image at the position of image inverted yellow arrow not at the focal point. 2f 30 f 15 cm The focal length of the lens is 15 cm. To determine the focal length of the lens practically we change the position of the image until we obtain a clear image.

A 5-cm high object is placed 15 cm from a 30-cm focal length diverging lens.

Determine the focal length of the lens. The light passes through the diverging lens and on to a converging lens of focal length 10 cm that is 5 cm from the diverging lens. 28032010 A lighted candle is placed 40 cm in front of a diverging lens. Between the two lenses the light appears to diverge from a point X distance f to the left of the first lens. The diagram shows parallel light entering the diverging lens from the left. O Distance of object from the optical centre of the lens. 26122009 Let f be the unsigned focal length of the diverging lens. The focal length of a thick lens in air can be calculated from the lensmakers equation. The final image is real inverted and 19 cm beyond the converging lens. F is positive for a converging lens and negative for a diverging one. If a lens is biconcave a beam of light passing through the lens is diverged spread.