Question

Optical instruments like the periscope and kaleidoscope use the property of ________ in order to create the final image or images.

• A. refractions
• B. diffractions
• C. absorption
• D. multiple reflections

Answer 1

The correct option is D multiple reflections

Optical instruments like the periscope and kaleidoscope use the property of multiple reflections between plane mirrors in order to create the final image or images. In a periscope, two mirrors are placed at an angle of ${45}^{\circ }$ with respect to the frame of the periscope such that the mirrors are parallel to each other. This allows a person underwater to perceive the image of an object that is at the surface of the water body. In a kaleidoscope, the mirrors are kept at an angle of ${60}^{\circ }$ so that multiple reflections cause the small dispersed particles to form a pattern that is visually appealing.