Question

6. (a) Under what condition will a glass lens placed in
of the image
invisible?
a
transparent
liquid become
(b) Describe and illustrate with a diagram, how we
should arrange two converging lenses so that a
parallel beam of light entering one lens emerges as a
parallel beam after passing through the second lens.
(c) An object is placed at a distance of 3 cm from a
concave lens of focal length 12 cm. Find the
(i) position and (ii) nature of the image formed.​

Answer 1

Answer:

6 (c)

Explanation:

1/v + 1/u = 1/f

1/u = 1/f - 1/v

1/u = 1/12 - 1/3

1/u = 1-4/12

1/u = -3/12

u = 12/-3

u = -4 cm

Nature of the image is real and inverted