Question

A convex lens has a focal length of 10 cm. At what distance from the lens should
the object be placed so that it forms a real and inverted image 20 cm away from the
lens? What would be the size of the image formed if the object is 2 cm high? With
the help of a ray diagram show the formation of the image by the lens in this case.​

Answer 1

Answer:

focal length = 10 cm

v = 20 cm

1/f = 1/v - 1/u

1/10 = 1/20 - 1/u

1 / u = -1 / 20

u = -20 cm

the object must be placed 20 cm in front of the refracting surface of the concave mirror .

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