Question

(a) infinite
.38 The focal length of a canvex lens is 30 cm and the size of image is
a quarter of the object, the object distance is
(a) 90 cm
(b) 60cm
(c) 30 cm
(d) 40 cm​

Answer 1

Answer:

Verify the property a x ( b + c ) = a x b + a x c by

taking a = - 3/7 , b = 2/5 ,

c = - 4/9