Question

A pin hole camera produced a blurred image. How can the sharpness of image be improved?
a. By decreasing the size of the pin-hole.
b. By placing a convex lens in front of the pin-hole.
c. By decreasing the distance of the object from the pin-hole.
d. All of the above

Answer 1

Answer:

Sound waves are created when sounds make vibrations in the air. In this activity, your voice vibrates the air inside the cup, which are then transferred to the bottom of the cup. The bottom of the cup passes the sound waves to the string, and so on to the other cup.