fλ=vλmedium =μλvacuum
λmedium ⇒2×5×10143×108⇒0.3×10−6⇒300 nm
A monochromatic light of frequency 5×1014 Hz travelling through air, is incident on a medium of refractive index ' 2 '. Wavelength of the refracted light will be :
Held on 3 Apr 2025 · Verified 6 Jul 2026.
300 nm
600 nm
400 nm
500 nm
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A biconvex lens is formed by using two thin planoconvex lenses, as shown in the figure. The refractive index and radius of curved surfaces are also mentioned in figure. When an object is placed on the left side of lens at a distance of 30 cm from the biconvex lens, the magnification of the image will be : 
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