What happens after refraction, when: (i) a ray of light parallel to the principal axis passes through a concave lens? (ii) a ray of light falls on a convex lens while passing through its principal focus? (iii) a ray of light passes through the optical centre of a convex lens?
What happens after refraction, when: (i) a ray of light parallel to the principal axis passes through a concave lens? (ii) a ray of light falls on a convex lens while passing through its principal focus? (iii) a ray of light passes through the optical centre of a convex lens?
(i) The ray of light will pass through the principal focus after refraction. (ii) The ray of light will emerge parallel to the principal axis after refraction. (iii) The ray of light will pass undeviated after refraction.
Hint
Recall the properties of concave and convex lenses and how they affect the path of light rays.
Quick Oral Answer
After refraction, the path of the light ray changes according to the lens type and the angle of incidence.
Analysis & Explanation
After refraction, the path of the light ray changes according to the lens type and the angle of incidence. (i) A concave lens spreads out the light rays, so a ray parallel to the principal axis will pass through the principal focus after refraction. (ii) A convex lens converges the light rays, so a ray passing through the principal focus will emerge parallel to the principal axis after refraction. (iii) The optical centre of a convex lens is the point where the lens is thinnest, so a ray passing through this point will pass undeviated after refraction.
Common Mistakes
- 1confusing the properties of concave and convex lenses
Interesting Facts
The focal length of a lens is the distance between the principal focus and the optical centre.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2020?
This question carries 3 marks in the CBSE Class 10 Science 2020 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Light — Reflection and Refraction" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Refraction of Light" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2020 paper?
This is a Short Answer question from Section B in the CBSE Class 10 Science 2020 paper.