Question

What is the possible magnification of three times magnified image formed in a concave mirror? A) m=3 B) m±3 C) m=-3 D) m>3
​

Answer 1

Answer: nahi pata na

Explanation:

Answer 2

Given: Three time magnified image is formed in a concave mirror

To find: Value of m

Explanation: A concave mirror is a mirror with a positive focal length. When the object is placed between Centre and Focal point of the mirror, the image is formed at infinity. This image is bigger than the object. Here object and image both are on one side of the mirror. Both have negative values.

Using formula, m= -v/u

=> m = -3 ( both u and v have same negative sign and image is three times magnified)

Another case of magnification can be when object is placed between pole of mirror and focal point of the mirror. In this case, the image is formed on the other side of the mirror. Therefore the image distance and object distance have opposite signs.

Using formula,

m= -v/u

= 3 ( u has negative sign but v has positive sign and image is three times magnified.)

Therefore, the magnification in a concave mirror is +3 or -3 depending upon its position.