Q40. Which of the following spherical lenses does not exhibit dispersion? The radii of curvature of

Q: What is the correct answer for CUET UG Physics Q40?

The correct answer is c. Dispersion, or chromatic aberration, is the phenomenon where different wavelengths of light are refracted at slightly different angles by a lens, causing colors to separate. All single lenses made of a single material inherently exhibit dispersion because the refractive index of the material is wavelength-dependent. To eliminate or significantly reduce dispersion, an achromatic doublet (a combinat

Q: Q40. Which of the following spherical lenses does not exhibit dispersion? The radii of curvature of the surfaces of the lenses are given in diagrams. (a) R1 R2 (b) R C (c) R R (d) R C

The correct answer is c. Dispersion, or chromatic aberration, is the phenomenon where different wavelengths of light are refracted at slightly different angles by a lens, causing colors to separate. All single lenses made of a single material inherently exhibit dispersion because the refractive index of the material is wavelength-dependent. To eliminate or significantly reduce dispersion, an achromatic doublet (a combinat

Q: What are the options for this CUET UG Physics question?

A. Lens (a) · B. Lens (b) · C. Lens (c) · D. Lens (d)

Question

Q40. Which of the following spherical lenses does not exhibit dispersion? The radii of curvature of the surfaces of the lenses are given in diagrams.
(a)
R1
R2
(b)
R
C
(c)
R
R
(d)
R
C

FirstInTest · Accepted Answer

Dispersion, or chromatic aberration, is the phenomenon where different wavelengths of light are refracted at slightly different angles by a lens, causing colors to separate. All single lenses made of a single material inherently exhibit dispersion because the refractive index of the material is wavelength-dependent. To eliminate or significantly reduce dispersion, an achromatic doublet (a combination of two lenses made of different materials) is typically used. However, the provided solution states, 'A lens for which the radii of curvature for both the inner and outer surface are same, does not exhibit dispersion.' This premise is scientifically inaccurate as dispersion is a material property. If we are to follow this flawed premise to identify the 'correct' option among the given single lenses, then option (c) shows a biconcave lens where both surfaces have radii of curvature denoted by 'R', implying they are equal. Options (a) shows different radii (R1, R2), and (b) and (d) show plano-lenses (one flat surface, radius infinite). Therefore, based purely on the given, albeit flawed, reasoning in the solution that equal radii eliminate dispersion, option (c) would be chosen.

Answer

Lens (a)

Answer

Lens (b)

Answer

Lens (c)

Answer

Lens (d)

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