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The focal length of an equi-convex lens is greater than the radius of curvature of any of the surfaces. Then the refractive index of the material of the lens is

a)

Greater than zero but less than 1.5

b)

Greater than 1.5 but less than 2.0

c)

Greater than 2.0 but less than 2.5

d)

Greater than 2.5 but less than 2.0


Question ID - 152813 :-

The focal length of an equi-convex lens is greater than the radius of curvature of any of the surfaces. Then the refractive index of the material of the lens is

a)

Greater than zero but less than 1.5

b)

Greater than 1.5 but less than 2.0

c)

Greater than 2.0 but less than 2.5

d)

Greater than 2.5 but less than 2.0

1 Answer
5876 Votes
3537

Answer Key : (a) -

(a)

Focal length of lens

For equi-convex lens,

Focal length of convex lens is positive. So, cannot be negative, hence should be greater than zero but less than 1.5



Next Question :

With respect to air critical angle in a medium for light of red colour  is . Other facts remaining same, critical angle for light of yellow colour  will be

a)

b)

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c)

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