PHY 114 Lecture Notes - Lecture 17: Real Image, Retina, Eyepiece
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For far away objects, the film must be placed one focal length from the lens. A person on a safari wants to take a photograph of a hippopotamus from a distance of 75. 0 m. 1(cid:3043) + 1(cid:3044) = 1(cid:3033) 1(cid:3044) = 1(cid:3033) (cid:2869)(cid:3043) . (cid:4593)= (cid:3044)(cid:3043) = (cid:2873)(cid:2868). (cid:2868) (cid:3040)(cid:3040) (cid:2875)(cid:2873). (cid:2868) (cid:3040) 4. 0 = 2. 67 q = 50. 0 mm. The image is 2. 67 mm long and is inverted. In the slides it says object, but i"m assuming he meant image. The lens has a variable focal length, which is adjusted to keep the image distance (q) constant as the object distance (p) varies. The lens of the eye is at a fixed distance from the retina (unlike in some cameras where this is adjustable) The near point is the closest distance from your eye that an object can be seen clearly. The far point is the farthest distance from your eye that an object can be seen clearly.