A sentence has been given in Direct/Indirect Speech. Out of the four given alternatives, select the one which best expresses the same sentence in Indirect/Direct Speech.
A monopoly is a market that has a single seller of a unique product in the market. He does not have any competition in the market as he has no substitute product for the product he is selling.
Find the power of a convex lens if the image formed is at a distance of 10 cm from the lens when the object is placed on the other side of the lens at 40 cm from the optical centre?