A lantern gives an image of 3m square of a slide 7.62cm square on a...
A lantern gives an image of 3m square of a slide 7.62cm square on a...
A lantern gives an image of 3m square of a slide 7.62cm square on a screen. If the screen is 10m from the projection lens of the lantern, calculate the focal length of the lens.
Select one:
A.
42.5cm
B.
48.9cm
C.
36.7cm
D.
24.8cm?
2 Answers Available
Asked by Olecranon fossa on 11th December, 2020
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