The reason why peephole lens in a hotel door have an approximately 180 ° view. a. The light moves straight through the lens into the eye. b. Light from about 90 ° from the straight-ahead direction is refracted into the observer’s eye, if very close to the lens. c. Light from about 90 ° from the straight-ahead direction is refracted into the observer’s eye, if looking at the lens from inside the room. d. The outside hall is illuminated, so reflected light from the objects inside the 180 ° angle goes into the lens. e. Both b and d.

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Chapter 23, Problem 93RPP

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The reason why peephole lens in a hotel door have an approximately 180° view.

a. The light moves straight through the lens into the eye.

b. Light from about 90° from the straight-ahead direction is refracted into the observer’s eye, if very close to the lens.

c. Light from about 90° from the straight-ahead direction is refracted into the observer’s eye, if looking at the lens from inside the room.

d. The outside hall is illuminated, so reflected light from the objects inside the 180° angle goes into the lens.

e. Both b and d.

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