Plzz answer question no 17 and 18 both

Plzz answer question no 17 and 18 both of waves as 10 cm of water when both are traversed by the same monochromic light. Ifthe refractive index of water is 4/3, the refractive index of glass is (d) 3/2 Snells Law 25. 17. 18. A beam of monochromatic blue light of wavelength 420 nm in air travels in water (g = 4/3). Its wavelength in water will be (a) 280 rm (c) 315 nm (b) 560 (d) run Ifvelocity of light in a certain medium is I S x rn's, g for the rnedium would be (c) 25 TIE wav of sodium

17.)Let's first get to the derivation of relationship between wavelength and refractive index.

Refractive index is ration of velocity of light in vacuum to the velocity of light in that medium.

Now we know, that velocity=frequency x wavelength.

Substituting that in equation of refractive index....

Please refer the calculations in the image

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For 18th

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17) 4/3?420 =560
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