Question

Two lenses of power 3D and -5D are placed in contact to form a composite lens. An object is placed at a distance of 50cm from this composite lens, find the position of the image.

Please answer the given question fast

Answer 1

Explanation:

Power = 3 + (-5)

          = -2 D or -2m (act as concave lens)

f = -1/2 = -50 cm

u= -50 cm

we know , 1/v - 1/u = 1/f

                  1/v =  -1/50 -1/50

                  1/v =  -1/25

      Therefore the image is 25 cm away from lens towards the left

                                  Hope u understand

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