Question #2940

The focal length of a convex lens is 17cm. A candle is placed 34cm in front of the lens. Find the location of the image. What is the magnification of the lens?

Expert's answer

From the formula

1/f = 1/d_{1} +1/d_{2}

we can find the locatin of the image:

1/d_{2} = 1/17 - 1/34 = 1/34

d2 = 34 cm.

The magnification is equal to m = -34/34 = -1.- The image is inverted.

1/f = 1/d

we can find the locatin of the image:

1/d

d2 = 34 cm.

The magnification is equal to m = -34/34 = -1.- The image is inverted.

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