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Consider the following statement: A ray of light passing through the optical centre of a convex lens emerges without any deviation after refraction. A ray of light passing through the first principal focus of a convex lens  emerges parallel to the principal axis after refraction. A ray of light passing through the optical centre of a convex lens emerges parallel to the principal axis after refraction. Which one of the following statements INCORRECT?

Consider the following statement: A ray of light passing through the optical centre of a convex lens emerges without any deviation after refraction. A ray of light passing through the first principal focus of a convex lens  emerges parallel to the principal axis after refraction. A ray of light passing through the optical centre of a convex lens emerges parallel to the principal axis after refraction. Which one of the following statements INCORRECT? Correct Answer Only 3

CONCEPT:

  • All the cases for the ray of light emanating from the source and refracting through a convex lens are shown in the table:

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EXPLANATION:

  • From the above diagram, it is clear that a ray of light, on passing through the optical center of a convex lens, emerges without any deviation after refraction. Therefore statement 1 is correct and statement 3 is incorrect.
  • From the above diagram, it is clear that a ray of light passing through the first principal focus of a convex lens emerges parallel to the principal axis after refraction. Therefore statement 2 is correct.

Related Questions

Given below are four statements- (p) The second principal focus of a lens is the position of the object, real or virtual whose image is at infinity. (q) The second principal focus of a lens is the position of the image, real or virtual whose object is at infinity. (r) The first principal focus of a lens is the position of the object, real or virtual whose image is at infinity. (s) The first principal focus of a lens is the position of the image, real or virtual whose object is at infinity.  Examine the above statements and find which among then are correct. 
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