A 103 nm thick transparent film (n = 1.38) is deposited on a glass (n = 1.52). L

Question

A 103 nm thick transparent film (n = 1.38) is deposited on a glass (n = 1.52). Light with certain wavelength will go under destructive thin film interface. What is the longest possible wavelength (in vacuum) of light that will not be seen as reflected light because of this effect? 434 nm 496 nm 569 nm 628 nm 664 nm Rays 1 and 2 both undergo 1/2 phase shift upon reflection, so this effect does not contribute to the net phase shift. The total phase shift is due to the path difference: An object is placed 50.0 cm in front of a lens whose focal length is 5.00 cm. Where will the image be located (in cm)? 5.6 10.0 12.2 7.5 4.5

Explanation / Answer

23. d

24.a    1/f=1/s+1/s'

            1/5-1/50=9/50=1/s'

s'=50/9=5.6 cm

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