The correct answer is A. Kaleidoscope.
A kaleidoscope is an optical instrument with two mirrors set at an angle to each other and a tube filled with loose colored materials. When the tube is turned, the materials reflect off the mirrors and create a constantly changing pattern.
A periscope is an instrument used to see over or around an obstacle. It consists of two mirrors, one at each end of a tube. The mirrors are angled so that light from an object above or below the observer is reflected into the observer’s eye.
A microscope is an instrument used to magnify small objects. It consists of a lens or lenses that
focus light onto the object, and an eyepiece that magnifies the image formed by the lens.A gyroscope is an instrument used to measure or maintain orientation and angular velocity. It consists of a wheel or disk mounted so that it can spin freely about an axis. The wheel is usually filled with a heavy liquid or gas, which helps to keep it stable.