Find the Refractive index of
glass which is a symmetrical
convergent lens if its focal length
is double of the radius of
curvature of its surface.Answer it...... if u are clever it's my challenge
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Find the Refractive index of
glass which is a symmetrical
convergent lens if its focal length
is double of the radius of
curvature of its surface.Answer it...... if u are clever it's my challenge
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Answer:
correct Answer is C: 3/2
explanation:
Convex lens focal length=R
Symmetrical lens=Hence=R1=R2=R
By sigh conventions convex lens: R1=+R
R2= -R
Lens makers formula :
1/f=(n-1)[1/R1-1/R2]
1/R=(n-1)[1/R+1/R]
1/R=(n-1)[2/R]
1=2n-2
2n=3
n=3/2 =1.5