The refractive index of the material of lens are 1.56 and 1.53 for yellow and red colours of light respectively. If the focal length of lens for yellow colour is 20 cm then calculate the focal length of lens for red colour.
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Answer:
f1/f2=0.5/0.6
Lens makers formula 1/f=(n-1)(1/R1–1/R2)
f is the focal length of the thin lens
R1 and R2 are the radii of curvature.
n1=1.6 (blue)
n2=1.5 (red)
substituting the values in the above formula we get the answer.
Explanation:
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