Question

An object is placed 20.0 cm in front of a concave mirror whose focal length is 25.0 cm. Where is the image located?

Answer 1

Answer:

0.06

Explanation:

Mirror formula: 1/f = 1/v + 1/u

Here, f = -25 and u = -20

Now by substituting the values in the formula we get,

3/50 = 0.06

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Answer 2

Answer:

Image located at back side of the mirror and at 100 cm distance.

Explanation:

• Concave mirror: If the bent in surface of a spherical mirror is reflecting surface then the mirror is called concave mirror.
• Image of an object becomes enlarged if the object is placed near to the mirror. For makeup and shaving purpose this mirror can be used

• Formula: If f = focal length, u = object distance and v = image distance Then the mirror formula will be, $\frac{1}{f}$ = $\frac{1}{v}$ + $\frac{1}{u}$
• Calculation: According to sign convention, f = -25cm, u = -20cm

                           Substituting these values in above equation,

                                      $\frac{1}{-25}$ = $\frac{1}{v}$ + $\frac{1}{-20}$

                                ⇒ $\frac{1}{v}$ = - $\frac{1}{25}$ + $\frac{1}{20}$ =  1/100

                                ⇒ v = 100cm

• Conclusion: Image will be formed in opposite side of the object.

       So in back of the mirror at 100cm distance image will be formed.