Question

30. The image of an object formed by a lens is of magnification -1. If the distance between
the object and its image is 60 cm, what is the focal length of the lens? If the object is
moved 20 cm towards the lens, where would the image be formed? State reason and also
draw a ray diagram in support of your answer.
OR
2 a l . ..mam fuam in the need of light becomes half of its value in air
(5)​

Answer 1

Answer:

persentage kese nikalege

Answer 2

then ask your maths teacher