Question

give the definition of focus point​

Answer 1

Answer:

Also called principal focus. ... the point at which all elements or aspects converge; center of activity or attention: The focal point of our discussion was the need for action.

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Answer 2

Answer:

Defination of focus point is The point on the mirror or lens where all the parallel rays after reflection converge or appears to be converge.

MORE TO KNOW-

• centre of curvature - The centre of the sphere which the mirror is a part is called centre of curvature.

• Apperature - The daimeter of the mirror or the reflecting part of the mirror.

• Focal length- The distance between centre of curvature and focus is called focal length.

• Principal axis - The parallel line passes from centre which is normal to the mirror is called principal axis.

• Radius - Raduis of the sphere which the mirror is a part is called radius.

• R = 2F

• Mirror formula = 1/V - 1/U = 1/F

• Lens formula = 1/V+ 1/U = 1/F

Types of mirrors -

i) Plane mirror

ii) Spherical mirror

2 types of spherical mirrors are

a) Concave mirror

b) Convex mirror