Question

A mirror always forms virtual image of the same size of the object. What id the focal length of the mirror ?
a)1cm b)1m c)more tham 1m but not infinity d)infinity

Answer 1

Answer:

Since it is a plane mirror, it's focal length is infinity

Answer 2

Answer:

The correct answer is : (d) infinity.

Explanation:

• A flat surface for reflecting is a plane mirror.
• Furthermore, as a result, in the case of a plane mirror, the parallel light beams are reflected back parallel to one another.
• So they never cross paths, or we could claim they do at infinity.
• Therefore, we can say that the plane mirror's focal length is infinite.
• A plane mirror's focal length is limitless since the image can be generated inside it at any distance.
• A plane mirror can be distinguished as an infinitely curved spherical mirror.
• Since the focal length is equal to one-half the curvature's radius, it is infinite.
• The focal length is positive if it's on the left side of the mirror, positive if it's on the right side of the mirror, zero if the reflected rays collide at the pole, and infinite if they never do.

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