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Grade: 12
        
The radii of curvature of the faces of a double convex lens are
20 cm and 25 cm. Its focal length is 20 cm. Calculate the
refractive index of the material of the lens.
2 years ago

Answers : (1)

Arun
23357 Points
							
Dear student
 
1/f = (n –1) [1/R1 – 1/R2]
1/20 = (n –1) [1/20 – 1/-25]
1/20 = (n –1) [9/100]
9n – 9 = 5
9n = 14
n = 14/9
n = 1.555
 
Regards
Arun (askIITians forum expert)
2 years ago
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