Question

Sample Problem 3. An object is placed at the following distances from a convex lens of focal length 10
cm :
(a) 8 cm (b) 15 cm (c) 20 cm (d) 25 cm
Which position of the object will produce :
(i) a diminished real image ?
(ii) a magnified real image ?
(iii) a magnified virtual image ?
(iv) an image of the same size as the object​

Answer 1

Answer:

Convex lens forms diminished, real and inverted image for object distance greater than 2f.

Convex lens forms real, inverted image of same size for object distance equal to 2f.

Convex lens forms magnified, real and inverted image for object distance between f and 2f.

Convex lens forms magnified, virtual and erect image for object distance lesser than f.

Hence,

for case (i) object distance is 25cm

for case (ii) object distance is 15cm

for case (iii) object distance is 8cm

for case (iv) object distance is 20cm