Question

Which of the following lenses would you prefer to use while reading small letters found in dictionary?


(a) A convex lens of focal length 50 cm 6)
A concave lens of focal length 50 cm

(c)A convex lens of focal length 5 cm

(d) A concave lens of focal length 5 cm the object​

Answer 1

Answer:

correct option is c) because a magnified image can only be formed by convex lens and by focal length you can calculate the power of the lens by using the formula Power (in dioptre)= 1/focal length (in m) so first convert focal length into m that is 5 cm it means 5/100 = 1/20 m = 20D= power of the lens.

always remember more will be the power , more will be its magnification.