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Question: 

What is the apparent deflection of a light beam in an elevator (Fig. 33–13) which is 2.4 m wide if the elevator is accelerating downward at $9.8 \textrm{ m/s}^2$?

(a) Light beam goes straight across an elevator which is not accelerating.

Figure 33-13 (a) Light beam goes straight across an elevator which is not accelerating.

(b) The light beam bends (exaggerated) according to an observer in an accelerating elevator whose speed increases in the upward direction.

Figure 33-13 (b) The light beam bends (exaggerated) according to an observer in an accelerating elevator whose speed increases in the upward direction.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$3.1 \times 10^{-16} \textrm{ m}$

Giancoli 7th Edition, Chapter 33, Problem 21

(1:50)

Chapter 33, Problem 21 is solved.

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