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The spherical surface of lens results in ________

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in Engineering Physics II by (679k points)
The spherical surface of lens results in ________

(a) having a wide range of focal length

(b) having a narrow range of focal length

(c) having a wide range of curvature

(d) having a narrow range of curvature

I got this question in unit test.

Enquiry is from Lenses topic in section Optics of Engineering Physics II

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The correct choice is (b) having a narrow range of focal length

To explain I would say: Most lenses are made of spherical surfaces because spherical surfaces are easy to make and have wide range of curvature. Hence, the spherical surface of lens only results in having a wide range of curvature, not wide range of focal length.

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