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Geometrical Optics question

2023 · 24 Jan · Shift 2 · Q52
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  5. /2023 · 24 Jan · Shift 2 · Q52

Geometrical Optics question

2023 · 24 Jan · Shift 2 · Q52

JEE MainPhysicsGeometrical OpticsMCQ+4 / −1
When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different point on the principle axis after refraction. This is called :
  1. A
    Spherical aberration
  2. B
    Scattering
  3. C
    Polarisation
  4. D
    Chromatic aberration
View written solutionFree

Correct answer: D

  1. Understand the situation

    A beam of white light contains many colours, and each colour has a different wavelength.

  2. Behavior of a convex lens for different colours

    The refractive index of the lens material depends on wavelength. Hence, different colours bend by different amounts when passing through the lens:

    • Violet light bends more
    • Red light bends less

    Therefore, different colours come to focus at different points on the principal axis.

  3. Identify the optical defect

    This defect, in which different colours have different focal lengths in a lens, is called chromatic aberration.

  4. Check the options

    • A: Spherical aberration — occurs due to different parts of a spherical lens focusing at different points, not due to colour. ❌
    • B: Scattering — refers to deviation of light in different directions by particles. ❌
    • C: Polarisation — refers to restriction of vibrations of light in a particular direction. ❌
    • D: Chromatic aberration — correct term for different colours focusing at different points. ✅

  5. Final answer

    The correct option is: D: Chromatic aberration\boxed{\text{D: Chromatic aberration}}D: Chromatic aberration​

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