An object is placed at a distance of 10 cm from a convex lens of power 5 D. The distance of the image is _______

-20cm

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40cm

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45cm

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-10cm

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Solution

The correct option is A -20cm
$u = - 10 c m P = 5 D f = \frac{1}{P} = 0.2 m = 20 c m \Rightarrow Using lens formula \frac{1}{v} - \frac{1}{u} = \frac{1}{f} \frac{1}{v} = \frac{1}{20} - \frac{1}{10} = \frac{1}{v} = - \frac{1}{20} v = - 20 c m$

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An object is placed at a distance of 10 cm from a convex lens of power 5 D. The distance of the image is _______

The correct option is A -20cmu=−10 cmP=5Df=1P=0.2 m=20 cm⇒ Using lens formula1v−1u=1f1v=120−110=1v=−120v=−20 cm

The correct option is A -20cm
$u = - 10 c m P = 5 D f = \frac{1}{P} = 0.2 m = 20 c m \Rightarrow Using lens formula \frac{1}{v} - \frac{1}{u} = \frac{1}{f} \frac{1}{v} = \frac{1}{20} - \frac{1}{10} = \frac{1}{v} = - \frac{1}{20} v = - 20 c m$