Question

the focal length of convex lens is 20 cm if an object of height 4 cm is placed at a distance of 30 cm from the lens ,find the position of the image the height of image the magnification produced by lens​

Answer 1

ANSWER:

• SEE IMAGE

EXPLANATION:

• WE ALWAYS TAKE 'U' AS NEGATIVE

• SIMILARLY WE ALWAYS TAKE 'f' AS POSITIVE

SO BY CALCULATION WE GET ,

'v' is in positive

WE TAKE OBJECT BETWEEN 'f' and '2f' BECAUSE 'u' is -30 and it falls between 20 and 40

*NOTE*

• RATIO IS ALWAYS POSITIVE