Question

an object is placed 15 cm in front of a convex lens of focal length 10 cm. find the position and nature of the image.

Answer 1

Answer:

Explanation: :

Here, u=−15cm,f=10cm,v=?

From 1v−1u=1f

1v=1f+1u=110−115=130

v=30cm,m=vu=30−15=−2

Image is real, inverted and magnified formed at a distance of 30cm from lens.

Now, the final image formed by concave mirror wil be at the position of the object itself only if image formed by the lens lies at the centre of curvature of the mirror.

:. Distance of mirror from the lens

=30+R=(30+20)cm=50cm