A lamp which is 10.0 cm tall is 351.0 cm in front of a converging lens which has

Question

A lamp which is 10.0 cm tall is 351.0 cm in front of a converging lens which has a focal length of 90.0 cm.
(a) What is the image distance for this lamp and lens combination (include sign if negative)?
1      cm

(b) If a screen is placed at the image location found in (a), what will be observed on the screen?
a- no image is visible on the screen

b- clear, upright, virtual image is visible

c- clear, upright, real image is visible

d- clear, inverted, real image is visible

e- clear, inverted, virtual image is visible

(c) If the screen is moved slightly closer to the lens than the distance found in (a), what will be observed on the screen?

a- a clear image slightly larger than the original image is visible

b- no image is visible on the screen    

c- a fuzzy image is visible

d- a clear image slightly smaller than the original image is visible

Explanation / Answer

Part A)

1/f = 1/p + 1/q

1/90 = 1/351 + 1/q

q = 121 cm

Part B)
Choice D

Part C)
Choice C

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