Experiment 6 — Find the Image

Topic: Physics · Class 10 · Light: refraction through a convex lens

Aim: Form a real, inverted, same-size image on the screen using the 15 cm convex lens.

Daily: A camera, a projector, a magnifying glass and the lens in your own eye all form images by this rule. Where you place the object decides everything.

Question: An object is placed at 2F in front of a convex lens. The image is…

Exp: Object at 2F gives image at 2F with magnification 1.

Exp: With the standard sign convention.

Question: A magnifying glass works with the object…

Exp: That gives a virtual, erect, magnified image.

Question: The power of a lens of focal length 50 cm is…

Exp: P = 1/f in metres = 1/0.5 = 2 D.

Question: Refraction happens because light…

Exp: Hence the bent-straw illusion.