Question

What are the sign conventions for concave mirror?

Answer 1

$\textbf{Answer is in Attachment !}$

Answer 2

Answer:

Here is the sign conventions for concave mirror.

• u is always negative for a real object.
• f(focal length) is always negative.
• v is always negative except when object is placed btw pole and focus and image is formed behind the mirror.
• h(of object) is considered always positive.
• h(of image) is positive for virtual and erect image . This happen only in one case when the object is placed btw P and F. In all other cases h(of image) is negative.
• m(magnification) is positive for virtual and erect image and negative for real and inverted image. Only when object is placed between P and F, the value of m is positive. Fo all other cases m is negative.

Extra Information as Note !!

• v is positive only when image is formed behind the mirror . In this case, Image is virtual and erect.

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