Chapter 34: Problem 108
A frog can see an insect clearly at a distance of 10 cm. At that point the effective distance from the lens to the retina is 8 mm. If the insect moves 5 cm farther from the frog, by how much and in which direction does the lens of the frog's eye have to move to keep the insect in focus? (a) 0.02 cm, toward the retina; (b) 0.02 cm, away from the retina; (c) 0.06 cm, toward the retina; (d) 0.06 cm, away from the retina.
Short Answer
Step by step solution
Understand the Problem
Apply Lens Formula
Calculate Initial Focal Length
Determine Image Distance for New Object Distance
Calculate New Image Distance
Calculate Lens Movement
Determine Lens Movement Direction
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Lens Formula
- \( f \) is the focal length of the lens.
- \( d_o \) is the distance from the object to the lens (object distance).
- \( d_i \) is the distance from the lens to the image formed (image distance).