Question

The focal length of a concave mirror is 15cm then
1. what are the characteristics of the image which is formed when the object distance 20cm?
2. where does an object to be placed to get an image of magnification 1?
3. where does an object to be placed to get an image at infinite distance?
please answer me fast​

Answer 1

Given:

f = -15cm (-ve because of concave mirror)

Solution:

1. this is the case when object is placed between f and C in this case the image formed will be beyond C
2. It should be placed at C as the image formed is just below the object.
3. it should be placed on F

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