Based on an exercise from Section 25.6 (Image Formation by Lenses) of OpenStax C

Question

Based on an exercise from Section 25.6 (Image Formation by Lenses) of OpenStax College Physies. The lens of a camera has a 31.2 mm focal length and is being used to photograph a flower that is 18 em tall and 718 em away. When the image of the flower is focused on the film, what is the height of the image? Give a positive value if the image is upright, and a negative value if the image is inverted. (Hint: Not a hint: please give this as a two-significant figure answer, regardless of any quantities that might appear in the problem.) Answer: Check

Explanation / Answer

By using lens formula, -1/u + 1/v = 1/f

1/71.8 + 1/v = 1/3.12

v = 1/[1/3.12 - 1/71.8] = 3.26 cm

height = h0*v/u = 18*3.26/-71.8

= -0.817 cm answer

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