An object is placed 15.0 cm to the left of a thin convex lens of focal length 20

Question

An object is placed 15.0 cm to the left of a thin convex lens of focal length 20.0 cm. The image of this object is located

30.0 cm to the left of the lens.

8.57 cm to the left of the lens.

60.0 cm to the left of the lens.

60.0 cm to the right of the lens.

8.57 cm to the right of the lens.

An object is placed 15.0 cm to the left of a thin convex lens of focal length 20.0 cm. The image of this object is located

30.0 cm to the left of the lens.

8.57 cm to the left of the lens.

60.0 cm to the left of the lens.

60.0 cm to the right of the lens.

8.57 cm to the right of the lens.

Explanation / Answer

1/v + 1/u = 1/f

1/v + 1/ (15) = 1/20

1/v = 1/20 - 1/15

v= 1/(-0.01666666666) = -60 cm

means on the left side 60 cm from lens

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