¿Qué longitud debe tener un tablón de madera de 7.5 cm por 30 cm de sección y densidad relativa 0.5 en agua salada (DR = 1.03) para soportar encima a un niño que pesa 45 kg?. Sch. 3-20.
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Object distance should be less than the focal length for the formation of an erect image. Hence, the range of distance of object from the mirror should be less than 15 cm i.e. from 0 to 15 cm in the front of mirror from the pole. The nature of image so formed will be virtual and erect. The size of the image will be larger than object. Ray diagram is attached as image to the question.
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