Chromatic Aberration in Lenses – Rankers Physics

Lens Makers Formula/ Len's Formula: Practice Problem & Solution

Assertion (A): If an object placed on the optic axis of a lens is illuminated by white light, then image formed will be coloured and not exactly white. Reason (R): The lens has different focal lengths for different colours.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Lens Makers Formula/ Len's Formula. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is true due to chromatic aberration. Reason (R) is true and correctly explains (A) because the refractive index of lens material varies with wavelength, causing different focal lengths for different colors.

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Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. Assertion (A): Concave mirror can not form real image of real object. Reason (R): Concave mirror behave as a diverging mirror.  
2. Assertion (A): When the upper half of a converging lens is missing, a real image formed by the lens for a real object will lack its lower half. Reason (R): The real image formed by a thin lens for a real object will be always erected.  
3. Assertion (A): A simple microscope may have different magnification for different persons. Reason (R): All persons must have the same near point distance of \(25\text{ cm}\).  
4. Assertion (A): A single lens cannot be free from chromatic aberration. Reason (R): When light passes through single lens dispersion must occur.  
5. A biconvex lens has radii of curvature, $20 cm$ each. If the refractive index of the material of the lens is $1.5$, the power of the lens is: (2022)