The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30cm is 2cm. If a concave lens of focal length 20cm is placed between the convex lens and the image at a distance of 26cm from the convex lens, calculate the new size of the image.

The size of the image of an object, which is at infinity, as formed by

1.	The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30cm is 2cm. If a concave lens of focal length 20cm is placed between the convex lens and the image at a distance of 26cm from the convex lens, calculate the new size of the image.
Answer» 1.25cm 2.5cm 1.05cm 2cm Solution :For the CONCAVE lens, `(1)/(v)-(1)/(4)=(1)/(-20)RARR v=5cm,(h_(2))/(h_(1))=\|(v)/(u)\|` `rArr h_(2)=2x(5)/(4)=2.5cm`

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The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30cm is 2cm. If a concave lens of focal length 20cm is placed between the convex lens and the image at a distance of 26cm from the convex lens, calculate the new size of the image.

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