Question

A real image 4/3 size of the object size formed 18 cm from the lens. calculate the focal length of the lens.​

Answer 1

hey here is your answer

since, object is real lense is convex.

O, object size = h

I, image size = 4h/3

m = I/O

m = (4h/3)/h

m = 4/3

v = 18 cm

m = v/u

4/3 = 18/u

u = 18 cm

1/v - 1/u = 1/f

1/18 - 1/18 = 1/f

1/f = 0

f = 0 cm

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Answer 2

Answer:

...... 90 cm

Explanation:

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