Question 3
Periscopes are often used to view objects that are not able to be seen directly, such as objects around corners. A man at O looks through a periscope at an object P as shown in the figure below. Mirrors M1 and M2 are located inside the periscope.
By using construction lines on the figure below and/or relevant calculations with explanation, mark out accurately the position image as seen by the man in M2 and label it as P’. [1 point]
(a) [First periscope diagram.]
(b) A man designed a periscope in this manner to see what is behind him overhead. By means of a ray diagram or otherwise, explain the main problem with this design. [1 point]
By using construction lines on the figure below and/or relevant calculations with explanation, mark out accurately the position image as seen by the man in M2 and label it as P’. [1 point]
(a) [First periscope diagram.]
(b) A man designed a periscope in this manner to see what is behind him overhead. By means of a ray diagram or otherwise, explain the main problem with this design. [1 point]