Two lenses that are 15.0 cm are used to form an image, as shown in the figure be

Question

Two lenses that are 15.0 cm are used to form an image, as shown in the figure below Lens 1 is diverging and has a focal length f_1 = -5.00 cm; lens 2 is converging and has length f_2 = +10.0 cm. The object is placed 5.00 cm to the left of lens 1. a) Find the position of the final image relatively to the lens 2. rinciple rays. b) Sketch a diagram showing the image formed by lens 1 and lens 2 using p c) What is the overall magnification of the final image? d) Is the final image upright or inverted? e) Is the final image real of virtual?

Explanation / Answer

a) d02 = 20cm
f2 = 10cm
So, d2 = (1/f2 - 1/d02)^-1
d2 = (1/10 - 1/20)^-1
= 20 cm

c) Overall magnification = m1*m2
= -d1/do1 * -d2/do2

d1 = (1/f1 - 1/d01)^-1
d1 = (1/-5 - 1/5)^-1 = -2.5

So, m = 2.5/5 * -20/20
= -0.5

d) Inverted

e) Real

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