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The image of an object placed at 60 cm in front of a lens is obtained on a screen at a distance of 120 cm from it. Find the focal length of lens. What would be the height of the image if object is 5 cm high .draw a ray diagram.pls help me to solve this . question​

Answer»

Object DISTANCE u = -60 cm

Image distance V = +120 cm

Lens formula, 1/F = 1/v - 1/u

1/f = 1/120 - ( -1/60 ) = 1/120 + 1/60 = 3/120 = 40 

f = +40 cm

H(image) / H(object) = v/u

Hi = -120/60 X 5 = -10 cm



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