Huygens’ Principle and Lenses – Rankers Physics

Huygen's Principal: Practice Problem & Solution

Assertion (A): Huygens's principle can explain converging nature of convex lens. Reason (R): Snell's law can be derived from Huygens's principle.  
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 Huygen's Principal. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is true. Huygens' principle, through its explanation of wavefront changes, can explain how a convex lens converges light.
Reason (R) is true. Snell's law of refraction, which governs how light behaves at interfaces, can be derived directly from Huygens' principle.

Reason (R) explains a fundamental principle (Snell's Law) that underpins the behavior of lenses, thus it correctly explains (A).

Leave a Reply

Your email address will not be published. Required fields are marked *

Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. Assertion (A): The fringe pattern in Young's double slit experiment is result of both phenomena of interference and diffraction. Reason (R): Diffraction results from superposition of wavelets of same wavefront.  
2. Assertion (A): In Young's double slit experiment if intensity of each source is \(I_0\) then minimum and maximum intensity is zero and \(4I_0\) respectively. Reason (R): In Young's double slit experiment energy conservation is not followed.  
3. Assertion (A): In case of single slit diffraction intensity of higher order maxima decreases. Reason (R): Higher order maxima are at larger distance.  
4. A beam of light of $lambda = 600 nm$ from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is: (2014)
5. Assertion (A): If three polarisers are arranged such that the axis of any two successive polarisers make equal angle with each other. If unpolarised light of intensity \(I_0\) incident on first polariser then intensity of emergent light after 3rd polariser is \(\frac{I_0}{8}\). If angle between them is \(45^\circ\). Reason (R): Each time intensity becomes \(50%\) by Malus law.