Question

an object is placed in front of a convex mirror of focal length 50 cm image formed is half of its size find the position of image​

Answer 1

Answer:

Explanation:

f=-20 cm, since convex mirror is diverging one, and u=50 cm, substituting these values 1/v becomes -0.07 and v is -14.28 cm where - denotes the image is virtual and it is just behind the mirror. If we take f=+20 cm and u=-50 cm following the mathematical behind sign convention there is no physical meaning.

For a diverging case, focal length is always negative and considering the object distance u it is always positive because object is real one. we may get v as +14.28 cm if we have chosen f=+20cm and u=-50 cm, but looking at the sign the image is real. It won’t happen in convex mirror.

For sign rules refer the book “UNIVERSITY PHYSICS WITH MODERN PHYSICS”-13th Edition

Answer 2

Answer:

at the focus...........