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A 50 cm tall object is at a very large distance from a diverging lens. A virtual, erect and diminished image of the object is formed at a distance of 20 cm in front of the lens. How much is focal length of the lens

Posted by Jai Pal 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 11 months ago

When an object is at a very large distance, the image is always formed at the focus of the lens or mirror. So the focal length is 20cm. Or

object distance (u)= -∞
image distance (v)= -20
focal length = f

{tex}\frac{1}{v} - \frac{1}{u}= \frac{1}{f} \\ \\ \frac{1}{-20} - 0= \frac{1}{f} \\ \\ f=-20cm{/tex}

So focal length is 20cm

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