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- Isnt the frequency suppsed to be c/wavelengthVery short pulses of high-intensity laserbeams are used to repair detached portions of the retina of the eye. Thebrief pulses of energy absorbed by the retina weld the detached portionsback into place. In one such procedure, a laser beam has a wavelengthof 810 nm and delivers 250 mW of power spread over a circularspot 510 mm in diameter. The vitreous humor (the transparent fluid thatfills most of the eye) has an index of refraction of 1.34. What average pressure would the pulse of the laser beam exert at normal incidence on a surface in air if the beam is fully absorbed?Two narrow SIIts sepevated by 0.42 mm are IllUminated by mon0- chromattclight ot wavelength 00 407nm. Huw many brignt Vinger Can he seen on a Screen I,9cm wide Placed 18m in tron1 OF the sl1ts?