© Department of Physics, University of Guelph.

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1. Are p, q and f positive or negative in the following?

Clock on pos or neg below.

(a)

p pos, neg;
q pos, neg;
f pos, neg

(b)

p pos, neg;
q pos, neg;
f pos, neg

(c)

p pos, neg;
q pos, neg;
f pos, neg

2. In the drawings in Q1 take the case:

(a) p = 20.0 cm, f = 12.0 cm

(b) p = 20.0 cm, f = -12.0 cm

(c) p = 10.0 cm, f = 12.0 cm

In each case find q and the magnification.

Two lenses of focal length 10.0 and -10.0 cm respectively are separated by 5.00 cm. An object 1.00 cm high is placed 15.0 cm to the left of the converging lens. Where, and what size is the final image? Is the image erect or inverted, real or virtual?