Question

Colby and Emmy are identical twins except for their vision. The retina is 1.8 cm behind the pupil in the eye. Colby’s prescription is -1.0 diopter, whereas Emmy’s prescription is +0.5 diopter. We use standard convention: we read a book at the distance 25-cm from the eyes and see objects very far from the eyes. Colby and Emmy wear identical frames at the distance 2.0 cm in front of their eyes.

a) Find the range of the power of the lens in Colby’s eyes.

b) Find the range of the power of the lens Emmy’s eyes.

c) Colby accidentally wears Emmy’s glasses. What is the range of object distances that Colby can see clearly?

d) Emmy accidentally wears Colby’s glasses. What is the range of object distances that Emmy can see clearly?

Answer 1

Solution in the uploaded images