Question

give the meanings of
1 optical center of lens
2 principal focus of a lens
3 principal focus of a convex lens
4 principal focus of a concave lens
5 focsl length of a lens
plz answer​

Answer 1

Answer:

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Answer 2

$\huge \red{answer}$

${ \green{\underline{ \underline{ \pink{ \mathfrak{optical \: centre \: of \: a \: lens}}}}}}$

The optical centre of a thin lens is a point on the principal axis coincding with the centre of the lens such that a light rag directed toward it passed through the lens undeviated.

${ \green{\underline{ \underline{ \pink{ \mathfrak{principal \: focus \: of \: a \: lens}}}}}}$

The principal focus of a lens is a point on the principal axis where light rays (1) parallel to the principal axis are convergent or appear to diverge from

(2)diverging from or appearing to converge are rendered parallel to the principal axis after refraction through the lens .

${ \green{\underline{ \underline{ \pink{ \mathfrak{principal \: foci \: of \: a \: convex \: lens}}}}}}$

the two po6 on the principal axis where light rays parelle to the principal axis are brought together and from where diverging light rays are rendered parallel to the principal axis after refraction are called the principal foci of the convex lens

${ \green{\underline{ \underline{ \pink{ \mathfrak{principal \: foci \: of \: a \: convcave \: lens}}}}}}$

The two points on the principal axis such that light rays parallel axis appear to diverge from them and to which light rays appearing to converge are rendered parallel to the principal axis after refraction are called the principal foci of the concave lens

${ \green{\underline{ \underline{ \pink{ \mathfrak{focal \: length \: of \: a \: lens}}}}}}$

The distance between the optical centre and principal focus of a lens called the focal length of the lens .

it is taken to be the distance between the optical centre and the second principal focus so that the focal length of a convex lens is positive while that of a concave lens is negative

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