A thin layer of SiO, having an index of refraction 1.5, is used as coating on certain solar cells. The refraction index of the solar cell is 3.5. The thickness of the SiO layer is D = 200 nm. If a visible beam with wavelength 2 (in air) has constructive interference when reflected from the top of the SiO layer, which of the following value can be the wavelength 1? Visible light spectrum is from 380 to 730 nm. 1 nm =1x10 9 m. air D Sio solar cell 500 nm 400 nm 460 nm 600 nm 540 nm 300A light source emits two wavelengths: 400 nm and 600 nm. A researcher shines the light source on a double-slit apparatus with a slit separation of 2.5x10-5 m. The diffraction pattern is observed on a screen 5 m away from the slit. What is the separation distance between the third-order bright fringes for the two wavelengths? 1 cm = 1x10-2 m. 1 nm =1x10 9 m. O 12 cm 10 cm O 6 cm O 8 cm 1 cm O 4 cmA real object is 2 cm tall. The object is placed on the left side of a converging lens with a focal length of 8 cm. The object forms an upright image by the lens. If the image is 20 cm away from the lens, what is the height of the image? Express the answer as a positive quantity. O 15 cm 12 cm O 9 cm O 7 cm O 20 cm 33 cmThe near point of a person's eye is 25 cm. The distance from the cornea-lens system to the retina is 2 cm. If the eye's power of accommodation is 3 D. What is the furthest object the person can see clearly? O 40 cm O 14 cm 88 cm 250 cm 100 cm 68 cm