Question

2. You are planning to take a picture of a distant object with a simple camera. (a) What kind of lens is used in the camera? What kind of image is formed on the film (sensor): - is this real or virtual? Is this upright or inverted? (3 points) (b) Draw a clearly the ray diagram showing the image formation. Label the object distance, image distance and the focal length. [8 points) I (c) You would like to photograph a 20-m tall tree from a distance of 40-m that creates an image of 30-mm height. Calculate the focal length of the lens need. Show all the steps. [10 points) (d) If you wish to take a picture of the same tree from further away and still get the image on the film/sensor, you would need to the distance between the lens and the film/sensor [2 points) A) increase B) decrease C) not change [2 points) Explain in 1-2 sentences how you made your choice.

Answer 1

Conuex lens real and inverted := А B of A U. wu ) object distance image distance f = focal length ho 20m hi = 30mm u = hi ₂ l v = 40 x 30 40 x 30 = 60 mm ho 2o 40m Now , 1 cl 1. t ruj decrease - 2 1 40 ㅗ + 60 40000 59.91 mm 13