Question

you take an object that is 5.30 cm high and place it 50.1 cm in front if a converging lens and observe an inverted image after the lens. the inverted image is measured with a ruler, and its length prove to be 22.3cm. what us the focal length of the lens in millineters?

Answer 1

PAGE No. 1. ** 22. 3 cm Given that the height of the object = 5.30cm and the height of the image ie the image is enlarged. Also, given that the inverted image is inverted, used is a converging lens, and the lens. convex lens. le a for a conver lens, magnification is the ratio of the size of the image formed by the lens to the of magnification height of image height of object size the object for a convex lens, of the image formed is meal and invested the magnification is taken as negative ie ME 4:20 22.3 cm 5.30 cm Also we have another formula for magnification lachere u = distance of image и u = distance of object from the lens. from the lens

PAGE No, 2. b = positive for U = right of the lens einage formed to the negative for object placed to the left of the lens an i'. m Also m= 4:20 4.20 =) - 50.1 cm ) = = 420 x 50.1 cm 2104 cm from the lens formula , we have I I V น Ho - - 210.4cm 50.1 f 1 3 It 210.4 cm 5o.1 CM ܓܛܠ f 50.1 + 210.4 210.4 X 50:1 См 260.5 1 0541.04 CM

(M - 260, 5 1054 1.04 cm - 10541.04 (m 40 : 46 M 26015 1cm = 10 mm - 40.46 X ID pm |: 4046mm .