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The principal focus of a convex lens is ...

The principal focus of a convex lens is virtual .
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The principal focurs of a convex lens is virtual.

Principal focus of convex lens:

Principal focus of concave lens:

Define the principal focus of a lens.

An object placed at a distance of a 9cm from the first principal focus of a convex lens produces a real image at a distance of 25cm. from its second principal focus. then the focal length of the lens is :

The rays of light falling on a convex lens in a direction parallel to principal axis of the lens, get refracted through the lens and meet actually at a single point F on the principal axis of the lens. This point is called principal focus of the lens. Read the above passage and answer the following questions : (i) Is principal focus of a convex lens, a real point ? Is the same true for a concave lens ? (ii) A distinct image of a distant tree os obtained on a screen held at 40 cm from a convex lens. What is its focal length ? (iii) Our teachers and parants advise us to stay focussed. What does it imply ?