Question

Draw the Ray diagram to find the image when an object is placed at a distance of8cm infront of a convex lens whose radius of curvature is 6cm on it's principal axis.
I want answer along with diagram

Answer 1

Object position (u) = - 20 cm (-ve sign due to position of object opposite to direction of incident ray)

Focal length (f) = -20 cm (focal length of concave mirror is always negative)

Mirror formula

1/f = 1/u + 1/v

-1/20 = -1/20 + 1/v

1/v = -1/20 + 1/20

1/v = 0

v = infinite ( not defined)