Image Formation by Lens (2)

Science

Not quite remember

I easily remember

Type of concave lens (3)

Concave meniscus

Is known as a converging lens

Convex lens

Is known as a diverging lens

Concave lens

Focal point, F of convex lens

Is a point where light rays parallel to the principal axis converge after passing through the convex lens

Focal point and focal length for convex lens

Focal point and focal length for concave lens

Focal point, F for the concave lens

When light rays which diverge after passing through a concave lens are extrapolated backwards, the light rays will intersect at a point

Definition of Optical centre, O

- Point at the centre of the lens - Light rays which pass through the optical centre do not refract

Definition of principal axis

A straight line which passes through the optical centre of a lens and the focal point, F

Definition of axis of lens

Straight line which passes through the optical centre and is perpendicular to the principal axis

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