An object is held 99.6 cm away from alens. The lens has a focal length of 47.9cm

Question

An object is held 99.6 cm away from alens. The lens has a focal length of 47.9cm.

a.) Determine the image distance.
1 cm

b.) Determine the magnification.
2

c.) If the object is 0.6 cm long,determine the image height.
3 cm

d.) Which of the followingare true about the image? Choose all that apply. 4 The image is inverted.The image is upright.The image is virtual.The image is real.

e.) Which of the followingare true about the lens? Choose all that apply. 5 The lens is concave.The lens is convex.The lens is converging.The lens is diverging. 4 The image is inverted.The image is upright.The image is virtual.The image is real. 4 The image is inverted.The image is upright.The image is virtual.The image is real. 4 5

Explanation / Answer

  (a) The image distance       q = pf / p -f = 99.6*47.9 / 99.6-47.9 = 92.3 cm (b) Magnification m = -q/p = -92.3 / 99.6 =-0.93
(c) magnification m = hf / hi      0.93 = hf / 0.6       hf = - 0.558 cm    Image is inverted real   

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