Question

5. An object at a distance of 30 cm from a concave mirror gets its image at the same point, The focal length of the mirror is: (a)- 30 cm(b) 30 cm(c)- 15 cm (d) +15 cm​

Answer 1

Answer:

As object and image are located at the same point and in front of concave mirror then we take u = +30 cm and v = + 30 cm. ... Thus, the focal length of mirror is 15 cm.