An object is placed 10 cm from a diverging lens which forms an image 6.5 cm from the lens. What is the focal length of the lens?

- 3.9 cm

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-18.5 cm

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+18.5 cm

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+ 3.9 cm

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Solution

The correct option is B
-18.5 cm

Since, it is a diverging lens, that is, a concave lens, we have

u = -10 cm, v = -6.5 cm

Thus,

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An object is placed 10 cm from a diverging lens which forms an image 6.5 cm from the lens. What is the focal length of the lens?

The correct option is B -18.5 cm Since, it is a diverging lens, that is, a concave lens, we have u = -10 cm, v = -6.5 cm Thus,

The correct option is B
-18.5 cm

Since, it is a diverging lens, that is, a concave lens, we have

u = -10 cm, v = -6.5 cm

Thus,