Question

An object is placed at the following distances from a concave mirror
of focal length 20cm(i) 60cm apart ii) 40cm apart iii) 20cm apart and iv) 15cm
apart from the mirror. In each position find the nature, position and
magnification of the image.​

Answer 1

Answer:

iii) 20cm apart

Explanation:

because the position is perfect for reflecting image

Answer 2

Explanation:

I) f=-20

u=-60

v=?

1/f=1/v -1/u

1/-20=1/v-1/-60

1/v=1/-20-1/-60

lcm=60

3/60-1/60

3-1/60

2/60=-30cm

sorry only one I know