By Team Aakash Byju's | 30th January 2023
The diagrams showing the correct path of the ray after passing through the lens are
II and III only
I and II only
I, II and III
I, II and IV
Let us see the reasons that explain why these diagrams are correct.
In (I), the ray is passing through the centre of the lens. As per the rules of refraction, it continues to travel in the same direction. Hence, (I) is correct.
(II) is correct: The ray is travelling parallel to the principal axis. As per the rules of refraction, the refracted ray passes through the focal point on the opposite side (F ).
In (III), the ray is passing through the first focal point (F ) of the lens, thus after refraction, it travels in a parallel direction to the principal axis. Thus, (III) is also correct.
(IV) is incorrect because a ray of light passing through F travels through F after undergoing refraction, which is not true.