Your lab partner used a convex lens to produce an image with d i = 25 cm and h i
ID: 2283717 • Letter: Y
Question
Your lab partner used a convex lens to produce an image with di = 25 cm and hi = 4.0 cm. You are examining a concave lens with a focal length of -15 cm. You place the concave lens between convex lens and the original image, 10 cm from the image. To your surprise, you see a real, enlarged image on the wall. You are told that the image from the convex lens is now the object for the concave lens, and because it is on the opposite side of the concave lens, it is a virtual object. Use these hints to find the location and size of the new image and to predict whether the concave lens changed the orientation of the original image.
Explanation / Answer
The new do = -10 cm.Thus
di = fdo / do - f
= (-15 cm)(-10 cm) / -10 cm - (-15 cm)
= +30 cm
m = - di / do = -30cm / -10cm = +3
hi = mho = (3)(4.0 cm) = 10 cm
The image orientation is not changed.
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