Question

The point, on the principal axis of a concave lens, from where a beam of incident
parallel ray appears to diverge, is called the
of the concave lens.
Plz Answer correctly​

Answer 1

Answer:

This point is known as the focal point. Notice that a diverging lens such as this double concave lens does not really focus the incident light rays that are parallel to the principal axis; rather, it diverges these light rays.

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Answer 2

Required Answer:-

The point, on the principal axis of a concave lens, from where a beam of incident parallel ray appears to diverge, is called the principle focus of the concave lens.

Other related terms:-

The other parts of the lens are as follows:

$\rm{LENS \begin{cases} \rm{Optical \: center(O)} \\ \rm{Principal \: axis} \\ \rm{Principal \: focus(F)} \\ \rm{Centre \: of \: curvature} \\ \rm{Radius \: of \: curvature} \\ \rm{Focal \: length} \end{cases}}$

Convex and concave lens are the two different types of lens. The convex lens is the one bulging outwards. Or we can say that the middle is thicker than edges at the tip. The concave lens is the one bulging inwards. Wider in the tip edges and thinner in the middle.