Question

Explain the following terms related to spherical mirror optical center , center of the curvature principal axis focal length​

Answer 1

Answer:

(a) (i) Optical center is defined as the point on the lens which is on the principal axis and the light ray doesn't deflect when passes through it.

(ii) Centre of curvature is defined as the center of the surface of sphere of which the lens is a part. Since, a lens has two surfaces, so the lens has two centers of curvatures.

(iii) Principal axis is defined as the straight lines passing through center of curvature.

(iv)Aperture is defined as the diameter of the boundary of the circular lens.

(v) Principal focus is defined as the point where beam of light parallel to principal axis, either converges or diverges after refraction.

(vi) Focal length is defined as the distance between the optical center and principal focus of the lens.

(b) Given: Convex lens (converging lens) Focal length of the lens f = +12 cm Image distance, v= +48 cm Applying the lens formula:

Thus, u=-16 cm

The object should be placed at a distance of 16 cm from the lens.

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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