Question

Define principal focus optica; centre and focal length

Answer 1

Answer:

Explanation:

principal focus, focus the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection Optical center of the lens is defined as the point which lies on the principal axis through the rays of light passes without any deflection.. 2 a central point of attention or interest.the distance between the centre of a lens or curved mirror and its focus.

the equivalent distance in a compound lens or telescope.

Answer 2

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$\bf\Huge\red{\mid{\overline{\underline{ ANSWER }}}\mid }$

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

DEFINE THE FOLLOWING TERMS IN RELATION TO SPHERICAL MIRRORS

PRINCIPAL AXIS

FOCAL LENGTH

PRINCIPAL FOCUS

CENTER OF CURVATURE

RADIUS OF CURVATURE

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

★ PRINCIPAL AXIS ★

THE STRAIGHT LINE THAT GOES TO THE CENTRE OF THE SPHERICAL MIRROR AT RIGHT ANGLE TO THE MIRROR IS CALLED PRINCIPAL AXIS

★ FOCAL LENGTH ★

IT IS THE DISTANCE ON PRINCIPAL AXIS FROM PRINCIPAL FOCUS TO THE POLES OF SPHERICAL MIRROR

★ PRINCIPAL FOCUS ★

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

★ CENTER OF CURVATURE ★

IT IS THE CENTRE OF THE SPHERE WHICH MIRROR IS A PART

★ RADIUS OF CURVATURE ★

IT IS A DISTANCE ON PRINCIPAL AXIS FROM CENTRE OF CURVATURE TO THE POLES OF SPHERICAL MIRROR

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