Physics-Lens

State rules for Image formation

A. A rat parallel to the principal axis passes through the focal point F after refraction from the lens (ray 1)

B. A ray passing through the optical centre of the lense continues straight without bending (ray 2)

C. A ray passing through the focal point after refraction from the lens, becomes parallel to the principal axis.

Explain formation of Real Image by a converging Lens

A convex lens produces a real image when the object is placed beyond it's focus. The image appears on the opposite side of the lens from where the object is located.

To determine the position and characteristics of an image formed by a convex lens, three rays are typically used as reference lines starting from a specific point on the object.

The principal axis is the horizontal line passing through the optical centre of the lens

The resulting image in this set up is real, inverted, and smaller than the actual object.

Explain formation of a virtual image by a converging lens.

For a convex lens to produce a magnified virtual image, the object should be placed between the lens and it's principal focus. In this position the image appears to be on the same side of the lens as the object.

It is upright, larger in size and cannot be projected onto a screen, as it is virtual.

Such an image is visible only when viewed through the lens.

This principal is used in magnifying glasses.

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