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Subject: PHYSICS Topic: Convex lens

Subject: PHYSICS Topic: Convex lens. Table of content. Light refraction in Prism Ray diagram of a convex lens Ray diagram illustrating graphical construction rules of a convex lens Simulation of the ray diagram The six special case of convex lens Daily applications of convex lens.

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Subject: PHYSICS Topic: Convex lens

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  1. Subject: PHYSICS Topic:Convex lens

  2. Table of content Light refraction in Prism Ray diagram of a convex lens Ray diagram illustrating graphical construction rules of a convex lens Simulation of the ray diagram The six special case of convex lens Daily applications of convex lens

  3. Convex lens teaching flow chart

  4. Light rays passing through two prisms QUESTION TIME In what way do the light rays pass through the prisms? The light rays converge after passing through the prisms!!

  5. The light rays converge!! QUESTION TIME

  6. AGAIN!!! The light rays also converge to the same point! QUESTION TIME

  7. Will the light rays still converge if we continue to cut the prisms? YES NO NO

  8. Convex Lens • thickest in the centre • bends light inwards • converging lens

  9. A B C D Which of the above is/are convex lens(es)? A & C

  10. F: Focus F: Focus Terminology of Convex lens F: Focus f = focal length (FC) C: Optical Center Principal axis f = focal length (FC) Convex lens Principal axis f C F F’ C: Optical Center

  11. C F F Convex lens Construction Rules  The light ray through the Optical Center C  The light ray through the focus F  The light ray parallel to the principal axis passes straight through the lens. is refracted through the focus F. is refracted parallel to the principal axis.       Now, we are going to find the image of an object formed by a convex lens by using these rules.

  12. By using the three construction rules of convex lens, draw a ray diagram of an object with object distance u = 15 cm. (Assume the focal length of the convex lens is 10 cm.) Can you find the image distance? Classwork Answer

  13. Converging Lens Simulation

  14. Case 1: Object distance >2f When the object distance is larger than 2f , do you know the image position? Object Object Image Image QUESTION TIME 2F 2F

  15. Descriptions of the image:Object distance >2f • Erect / Inverted • Erect / Inverted • Virtual / Real • Virtual / Real • Magnified / Diminished / • Same as the object • Magnified / Diminished / • Same as the object • Position of image: Between the position of F and 2F on the other side of the object.

  16. Case 2: Object distance = 2f Object Object 2F QUESTION TIME 2F Image Image

  17. Descriptions of the image:Object distance = 2f • Erect / Inverted • Erect / Inverted • Virtual / Real • Virtual / Real • Magnified / Diminished / • Same as the object • Magnified / Diminished / • Same as the object • Position of image: At the position of 2F on the other side of the object.

  18. Case 3: Object distance between f and 2f Object Object Image Image QUESTION TIME 2F 2F

  19. Descriptions of the image:Object distance between f and 2f • Erect / Inverted • Erect / Inverted • Virtual / Real • Virtual / Real • Magnified / Diminished / • Same as the object • Magnified / Diminished / • Same as the object • Position of image: Image distance > 2f on the other side of the object.

  20. Case 4: Object distance = f Where is the image? Object Object 2F 2F

  21. Descriptions of the image:Object distance = f • Position of image: Image forms at infinity.

  22. Case 5: Object distance < f Image Image Object Object QUESTION TIME 2F 2F

  23. Descriptions of the image:Object distance < f • Erect / Inverted • Erect / Inverted • Virtual / Real • Virtual / Real • Magnified / Diminished / • Same as the object • Magnified / Diminished / • Same as the object • Position of image: On the same side of the object.

  24. Case 6: Very large object at infinity For a very large image at infinity: Convex lens The light rays are nearly parallel to each other!

  25. Remember the construction rules of convex lens. F 2F 2F F Case 6: Very large object at infinity Do you know how parallel light rays are refracted?

  26. Descriptions of the image:Object distance >2f • Erect / Inverted • Erect / Inverted • Virtual / Real • Virtual / Real • Magnified / Diminished / • Same as the object • Magnified/ Diminished / • Same as the object • Position of image: Formed at the focal plane

  27. Descriptions of the image:Object distance >2f • Erect / Inverted • Erect / Inverted • Virtual / Real • Virtual / Real • Magnified / Diminished / • Same as the object • Magnified/ Diminished / • Same as the object • Position of image: Formed at the focal plane

  28. Application of Convex lens • Camera • Magnifying glass

  29. The End

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