Question

T he focal lengths of a convex lens and concave lens are 10cm and 15cm respectively.Both lenses are kept in contact.An object is placed at a distance of 25cm from this combined lens. determine the position of image of the object??



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Answer 1

Answer:

Please mark mr brainliest

Explanation:

f1=10cm;f2=−20cm

we know,

f1=f11+f21

f1=101−201

f=20cm

this indicates that the lens is converging.

given: u=−20cm

f1=v1−u1

v1=f1+u1

v1=201−201

v=infinity