48) A soap bubble (n 1.35) is floating in air. If the thickness of the bubble wa

Question

48) A soap bubble (n 1.35) is floating in air. If the thickness of the bubble wall is 322 nm, which of the following wavelengths of visible light is strongly reflected? a. 540 nm (green) b. 620 nm (red) c. 500 nm (blue) d. 580 nm (yellow) 49) what is the minimum, thickness of a glycerin film (n 1.47) on which light of wavelength 450 nm shines that results in constructive interference of the reflected light? Assume the film is surrounded front and back by air a. 150 nm b. 76.5 nm c. 204 nm d. 102 nm 50) A converging lens with a focal length of 40 cm and a diverging lens with a focal length of -40 cm are 160 cm apart. A 2.0 cm tall object is 60 cm in front of the converging lens. Determine the location of the final image Determine the size of the final image a. Real; Upright; Larger b. Real; Inverted; Smaller c. Imaginary; Inverted; Smaller d. Imaginary; Inverted; Same Size

Explanation / Answer

Answer:

We have equation for the wavelength => 2nt = (m + 1/2) * y

where y is wavelength, m is an integer.

t = 322 * 10 ^ -9 m

n =1.35

Therefore y = 2nt / (m + 0.5)

= 2 * 1.35 * 322 * 10^-9 / (1 + 0.5)

=579.6 * 10 ^-9 m

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