Question

With the use of Mirror formula, find
f, when u and v are same i.e. 20 cm, what will be the value of f in concave mirror
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Answer 1

Answer:

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Answer 2

Answer:

f = 10

Explanation:

It is an equation relating object distance and image distance with focal length is known as a mirror equation. It is also known as a mirror formula. In a spherical mirror: ... The distance between the Principal focus and pole of the mirror is called Focal Length(f).

mirrors formula ⇒ 1/f = 1/u +1/v

f = ? , u = v = 20

in concave mirror -1/f = -1/u -1/v ∵f,u,v are -ve in concave mirror

∴ -1/f = -1/20-1/20

f = 10