Why is the focal length of a plane mirror infinite?

Why is the focal length of a plane mirror infinite?

The focal length of a plane mirror is infinity as the image can be formed at an infinite distance inside the mirror. A plane mirror can be recognised as a spherical mirror of infinite radius of curvature. Focal length is half of the radius of curvature and hence it is infinity.

What is focal length of plane mirror is mirror formula valid on it explain?

Focal length is half of radius of curvature and hence it is infinity. You can use the mirror formula also to get the focal length of a plane mirror, where the image distance = − object distance.) The focal length of a plane mirror is infinite.

Is mirror formula applicable on plane mirror?

Yes, it is true. The mirror formula applicable to the plane mirror. The mirror formula applicable to all types of mirrors. Mirror formula states that the relationship integrates image distance, object distance and focal length of the mirror.

Is focal length of concave mirror positive?

The focal length f of a concave mirror is positive, since it is a converging mirror. Figure 2. (a) Parallel rays reflected from a large spherical mirror do not all cross at a common point.

Is there any formula for plane mirror?

The Mirror Equations f=R/2 or f=∞ for a plane mirror.

What is plane mirror formula?

v = – u, i.e. the image distance is equal to the object distance and the image is on the back side of the plane mirror. Hence, the mirror formula is also true for plane mirrors.

Can the focal length of a plane mirror be zero?

The focal length is positive if it is on the left side of the mirror, it is positive if it is on the right side of the mirror, it is zero if reflected rays meet at the pole and it is Infinity if reflected rays never meet. So, the focal length of the plane mirror is Infinity.

What is focal length of concave mirror?

Focal Length – The distance between the pole P of the concave mirror and the focus F is the focal length of the concave mirror. Thus, the focal length of a concave mirror can be estimated by obtaining a ‘Real image’ of a distant object at its focus, as shown in the figure.

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