A convex lens is said to have real focus and a concave lens a virtual focus. Why?

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Dear student

A convex lens converge light rays at its focus therefore it is said to produce real focus whereas the concave lens diverges the light rays that seems to come from focus therefore it is virtual.

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Q. A concave mirror is said to have a real focus whereas a convex mirror is said to have a virtual foucs. apply the same logic to concave and convex lenses and say which of them has a real focus and which has a virtual focus.

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Q. Define the principal focus of a convex lens and that of a concave lens.

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A convex lens is said to have real focus and a concave lens a virtual focus. Why?

Dear student A convex lens converge light rays at its focus therefore it is said to produce real focus whereas the concave lens diverges the light rays that seems to come from focus therefore it is virtual. ​​​Regards

Dear student

A convex lens converge light rays at its focus therefore it is said to produce real focus whereas the concave lens diverges the light rays that seems to come from focus therefore it is virtual.

Regards