The lens with a long focal length is thin and not strongly curved.
Explanation:
→ The focal length of a lens depends upon the thickness as well as curvature of the lens.
→ A thick lens will refract and converge the light up to a greater extent and thus decreasing its focal length. On the other hand, a thin lens will refract and converge the light to a lesser extent and thus increasing its focal length.
- Therefore a lens with a longer focal length is thicker in size whereas a lens with a smaller focal length is thinner in size.
→ The higher angles of curvature of the lens lead to shorter focal lengths because light waves are refracted at a greater angle with respect to the principal axis of the lens hence decreasing its focal length.
- Thus a lens with a strong curvature has a smaller focal length whereas a lens with a small angle of curvature has a larger focal length.
Hence we can say that the lens with a long focal length is thin and not strongly curved.
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