Question

The radius of carvature of it's face of a
bi concave lens made of glass of refractive
index 1.5 is 30 cm
calculate the focal
length of the lens in air. ​

Answer 1

Answer:

Explanation:

The focal length of the lens in air is 30 cm.

Explanation:

Given that,

Refractive index n = 1.5

Radius of curvature R = 30 cm

We know that,

The relation between focal length, radius of curvature and refractive index is

Hence, The focal length of the lens in air is 30 cm.

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