Chapter 30, Problem 36P

You've dropped your car keys at night off the end of a dock into water 1.6 m deep. A flashlight held directly above the dock edge and 0.50 m above the water illuminates the keys when it’s aimed at 40° to the vertical, as shown in Fig. 30.21. What’s the horizontal distance x from the edge of the dock to the keys?

  37. Laser eye surgery uses ultraviolet light with wavelength 193 nm. What’s the UV light’s wavelength

  

FIGURE 30.21 Problem 36