Question

what is principal focus???​

Answer 1

Answer:

A principal focus or focal point is a special focus:

• For a lens or a spherical or parabolic mirror, it is a point onto which collimated light parallel to the axis is focused. Since light can pass through a lens in either direction, a lens has two focal points – one on each side. The distance in the air from the lens or mirror's principal plane to the focus is called the focal length.

• Elliptical mirrors have two focal points: light that passes through one of these before striking the mirror is reflected such that it passes through the other.

• The focus of a hyperbolic mirror is either of two points which have the property that light from one is reflected as if it came from the other.

Answer 2

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$\Large\fbox{\color{purple}{CORRECT \: QUESTION}}$

DEFINE THE FOLLOWING TERMS IN RELATION TO SPHERICAL MIRRORS

PRINCIPAL FOCUS

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$\Large\fbox{\color{purple}{ SOLUTION }}$

★ PRINCIPAL FOCUS ★

IT IS A POINT ON PRINCIPAL AXIS WHERE ALL REFLECTED RAYS ARE EITHER CONVERGE OR DIVERGE

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