An object is held 83 cm away from a lens. The lens has a focal length of-12.8 cm

Question

An object is held 83 cm away from a lens. The lens has a focal length of-12.8 cm. A.) Determine the image distance. cm B.) Determine the magnification. C) Ifthe object is 2.7 cm long, determine the image height. X cm D.) Which of the following are true about the image? Choose all that apply. O The image is real. The image is virtual. The image is upright. O The image is inverted. E.) Which of the following are true about the lens? Choose all that apply. O The lens is diverging. The lens is converging. The lens is concave. The lens is convex.

Explanation / Answer

object distance, s = 83 cm

f = - 12.8 cm

(A) 1/f = 1/s + 1/s'

- 1/12.8 = 1/83 + 1/s'

s' = - 11.1 cm

(B) m = - s'/ s = 0.134  

(C) m = hi / ho

0.134 = hi / 2.7

hi = 0.36  

(D) s' < 0 -> virtual

m > 0 => upright

(E) lens is diverging.

lens is concave.

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