Focal length of a lens is given by:since r1 and r2 are equal, and focal length f is equal to radius of curvature, i.e. f = r1 = r2, putting these values in above formula. The refractive index μ= 1.5

Q. 55.0( 1 Vote )

The focal length

Class 12th Physics - Board Papers

Answer :

Focal length of a lens is given by:

since r₁ and r₂ are equal, and focal length f is equal to radius of curvature, i.e. f = r₁ = r_2, putting these values in above formula. The refractive index μ= 1.5

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