In a scene from a movie, a nearsighted character removes hiseyeglasses and uses

Question

In a scene from a movie, a nearsighted character removes hiseyeglasses and uses them to focus the nearly parallel rays of thesun to start a fire. What is physically wrong with thisscene?

a. The eyeglasses have converging lensesand cannot be used to focus parallel rays.
b. A fire can only be started if theimage is virtual.
c. Parallel rays cannot befocused.
d. The eyeglasses have diverging lensesand cannot be used to focus parallel rays.
e. Sunlight cannot be used to start a fire. In a scene from a movie, a nearsighted character removes hiseyeglasses and uses them to focus the nearly parallel rays of thesun to start a fire. What is physically wrong with thisscene? The eyeglasses have converging lensesand cannot be used to focus parallel rays. A fire can only be started if theimage is virtual. Parallel rays cannot befocused. The eyeglasses have diverging lensesand cannot be used to focus parallel rays. Sunlight cannot be used to start a fire.

Explanation / Answer

Myopia (nearsightedness) forms the image of a distant objectin front of the retina. A divering lens lens with negativerefrctive power can compensate for the nearsightedness by bendingthe rays outward. So the eyeglass are diverging lens. The parallel rays cannotbe focused at one point to start fire.

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