Question

difference between focus of concave lens and focus of convex lens

Answer 1

hello ☺

Convex lens:

⏺A lens that possesses at least one surface that is curved outward is known as a convex lens.

⏺If both the surfaces of the lens are curved outward, it is known as a biconvex lens.

⏺The image formed by a convex lens will be real and inverted, except when the object is between the focus and the optical center.

⏺When the object is between the focus and the optical center, the image formed will be virtual and erect.

Uses: Telescopes, spectacles, microscopes etc.

Concave lens:

⏺A lens that possesses at least one surface that is curved inward is known as a concave lens.

⏺If both the surfaces of the lens are curved inward, it is known as a biconcave lens.

⏺The image formed by the concave lens will be always virtual and erect.

Uses: Telescopes, spectacles etc.

thank you

Answer 2

$\huge\mathbb{ANSWER}}$

$\texttt{concave mirror:-}$

➜the points at which rats parallel to principal axis coming from infinity converge after being reflected from concave mirror is called the principal focus of concave mirror

$\texttt{convex mirror :}}}$

➜ the point which rays parallel to principal axis coming from infinity appear to converge after being reflected from Convex mirror is called the principal focus of convex mirror