Question

what are the types of spherical lenses? describe the principle focus, Aperture and optical centre of a spherical lens.. thanks​

Answer 1

Answer:

There are two types of spherical lenses: (i) Convex or Converging Lenses : These are thick in the middle and thin at the edges. (a) Double Convex Lens : It has both the surfaces convex. (b) Plano–Convex Lens : It has one surface plane and the other surface convex

Aperture is defined as the diameter of the boundary of the circular lens. Principal focus is the point at which a beam of light that is parallel to principal axis will converge/diverges after refraction. Focal length is the distance between the optical center and principal focus of the lens

Explanation:

Answer 2

There are two types of spherical lenses:

i)Convex

ii)Concave

Principal focus:

For Convex: The Principal focus of a converging lens is the point to which a beam of light parallel to the principal axis converges after refraction.

For Concave: The Principal focus of a diverging lens is a point from which a beam of light parallel to principal axis appears to diverge after refraction.

Optical centre:Optical centre is a point inside the lens through which a ray of light passes undeviated from the lens.

Aperture:

The area of the lens available for refraction is called the aperture of the lens.

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