Question

focal length of double convex lens is

1)inversely proportional to the refractive index of lens

2)directly proportional to the refractive index of medium in which lens placed

3)directly proportional to the wavelength of light
directly proportional to the radius of curvature of lens

4)all of above​

Answer 1

Answer:

3

Explanation:

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Answer 2

3) directly proportional to the walvelenght of light directly proportional to the radius of curvature of lence