Question

The concave mirror has focal length 20cm.The range of object distance to produce erect and magnified image by the mirror is

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Answer 1

Answer:

20 cm

Explanation:

The focal length of the mirror is 20cm.

In the case of real image,

The object distance is u1, then the image distance will be −2u1.

The mirror formula is given as,

v1+u1=f1

−2u11−u11=20−1

u1=30cm

In the case of virtual image,

The object distance is −u2, then the image distance will be 2u2.

The mirror formula is given as,

v1+u1=f1

2u11+−u11=20−1

u2=10cm

The distance between two positions of object is given as,