Question

Image seen by a periscope is

• A. Both a) & b)
• B. Logitudnally inverted
• C. Neither a) nor b)
• D. Laterally inverted

Answer 1

The correct option is C Neither a) nor b)

The image seeing by a periscope is a reflected image and not laterally inverted.
In the periscope, light hits the top mirror at 45 degrees and reflects away at the same angle. The light then bounces down to the bottom mirror. When that reflected light hits the second mirror it is reflected again at 45 degrees, right into our eye. Hence, the image is due to the reflections at two mirrors. So, lateral inversion happens twice consecutively and the final image is neither laterally inverted nor longitudinally inverted.