Question

) When an object is placed before the convex lens at a distance of
24 cm on the principal axis, the image distance is half of the object
distance. Then what is it's focal length ?​

Answer 1

Answer:

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Explanation:

U must find focal length by formula of lens or f = r/2.

Answer 2

Answer:

u=-24

m=-1/2

v=?

Explanation:

m=v/u. = -1/2=v/-24. v=-1*-24/2. v=12cm. 1/f=1/v-1/u. =1/12+1/24 =3/24. =f= 8cm