the refractive index of the material of a concave lens is 1.5 and radii of curvature are 40 cm and 60 cm respectively. find the focal length of the lens when it is kept in air
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The focal length of the mirror is 240 cm
Explanation:
Given:
The refractive index of concave lens
The radius of curvature
cm
cm
To find out:
The focal length of the lens in air
Solution:
We know that the relation between the given quantities and focal length is
Since the lens is concave, will be left facing hence negative and will be right facing hence positive
cm
Hope this answer is helpful.
Know More:
Q: A double concave lens with the refractive index 1.5 is kept in the air . Its two spherical surfaces have radii R1 = 20 cm and R2 = 60 cm . Find the focal length of the lens . Write the characteristics of the lens.
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