Chapter 26, Problem 80PCE

Predict/Calculate A friend tells you that when he takes off his eyeglasses and holds them 23 cm above a printed page the image of the print is erect but reduced to 0.67 of its actual size (a) Is the image real or virtual? How do you know? (b) What is the focal length of your friend’s glasses? (c) Are the lenses in the glasses concave or convex? Explain.