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an object 4 cm high is placed 15 cm from a convex lens of focal length 5 cm. draw a ray diagram on graph paper and find position , nature and size of the image |
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Answer» tion:object's height, h_0h 0 = 4cmobject distance , u = -15cmfocal length of convex LENS , f = +5cmusing lens maker formula,1/v - 1/u = 1/for, 1/v - 1/-15 = 1/5or, 1/v = 1/5 - 1/15 = 2/15or, v = 15/2 = +7.5 cmas IMAGE distance is positive, image is real and it is located at 7.5cm behind the lens ( right side).magnification, m = v/u = height of image /height of object.or, (+7.5)/(-15cm) = height of image/(4cm)or, height of image = -2CM < height of objecthence, image is real and diminished.see diagram , which shows image position, NATURE and size. |
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