Question

a point object is placed on the principal axis of a concave mirror white part away from the pole and is moved at a constant speed was the pole. it is found that the object and image cross each other at a point p which is at a distance 70 cm from the pole .
a) find the focal length of the mirror
b)what is the magnification of image formed when object and image cross each other
c)what will be the position of image when the object reaches of the focus of mirror
d) what will the nature of the image after it crosses the focus of mirror​

Answer 1

Answer:

a. focal lenght become 35 cm since u=v=70cm

b.Magnification =v/u

70/70=1

c.The position of image become at infinity when object reaches to focus of mirror

d.The nature of image after  it crosses the focus are virtual and magnified