Question

This instrument is used in submarines to observe activity above the water surface while the submarine is submerged. Which instrument are we talking about?
A. Binoculars
B. Telescope
C. Periscope
D. Kaleidoscope

Answer 1

Hint:We know that all the instruments given as options work on different principles. Due to this, each one of them has different applications. Therefore, we will discuss the applications of each instrument and determine which one is useful for its application in the submarine.

Complete answer:
All the instruments given as options are optical devices and instruments have been designed to utilize reflecting and refracting properties of mirrors, lenses and prisms.Let us first consider binoculars. They are versatile tools that provide enlarged images of distant objects. Note that binoculars are made of two telescopes mounted on a single frame, which allows the use of both eyes.

Our second option, telescope, is an instrument used to see objects that are far awayTelescopes are often used to view the planets and stars. Some of the same optical technology that is used in telescopes is also used to make binoculars and cameras. The third option, periscope can be defined as an instrument used for observing over, around or through an obstacle or object which is prevented by direct line of sight.

Thus it is the suitable instrument for submarines to observe activity above the water surface while the submarine is submerged.Finally, Kaleidoscope is an optical toy consisting of two mirrors at a particular angle. Some common uses of the kaleidoscope are: Kaleidoscope produces beautiful patterns that are used by fashion designers. A kaleidoscope is used as a toy for entertainment.

Thus, from the applications from all the instruments, we can say that option C is the right answer.

Note:It is important to know that a periscope works on the basis of laws of reflection of light. Any object in the line of sight reflects the light making it visible in the periscope. The mirrors are placed at an angle of forty five degrees in such a way that when light falls on one of the mirrors, it gets reflected back making it fall on the other mirror which further gets reflected back to the observer’s eyes.