Q.

The refractive index of a converging lens is 1.4. What will be the focal length of this lens if it is placed in medium of same refractive index? Assume the radii of curvature of the faces of lens R1 and R2 respectively.

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a

R1​R2R1−R2

b

1

c

zero

d

infinite

answer is D.

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Detailed Solution

Lens Makers Formula,  1f=n2n1−11R1−1R2 If n1=n2, then  ⇒1f=0  ⇒f→∞
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The refractive index of a converging lens is 1.4. What will be the focal length of this lens if it is placed in medium of same refractive index? Assume the radii of curvature of the faces of lens R1 and R2 respectively.