Multiple-Choice Homework Problem 22.7 [3 pt(s) ] You are stranded on a desert is

Question

Multiple-Choice Homework Problem 22.7 [3 pt(s) ] You are stranded on a desert island and you want
to start a fire by focusing sunlight with a lens. You decide to make a plano-convex lens out of a piece of sodium
chloride that you found. You want the lens to have a focal length of 25cm. The index of refraction of sodium
chloride is 1.54. A plano-convex lens is formed of one plane surface and one curved surface. What must the
radius of curvature of the curved surface be?
Select One of the Following:
(a) 13.5cm
(b) 38.5cm
(c) 46.3cm
(d) 1.9cm
(e) 25cm

Explanation / Answer

lens makers equation

1/f = (n-1)*((1/R1) - (1/R2))

R1 = infinity

R2 = -R

1/25 = (1.54-1)*(1/R)

R = 13.5 cm

OPTION a

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