A candle is placed 54 cm from a lens. An upright image is formed as shown in Fig

Question

A candle is placed 54 cm from a lens. An upright image is formed as shown in Figure. The height of the image is a quarter of the object height.

(a) Is this lens a diverging or converging lens? converging lens diverging lens (I know it is diverging)

(b) Find the focal length of the lens.

A candle is placed 54 cm from a lens. An upright image is formed as shown in Figure. The height of the image is a quarter of the object height. (a) Is this lens a diverging or converging lens? converging lens diverging lens (I know it is diverging) (b) Find the focal length of the lens.

Explanation / Answer

fdiverging lens

v= - 0.25*54

= -13.5 cm

1/f = 1/v -1/u

= -1/13.5 + 1/ 54

f = -13 cm

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