A) Stethoscope
B) Altimeter
C) Hydrometer
D) Periscope
Answer: D
Explanation: Periscope means a viewing instrument using mirrors or prisms to see over an obstacle. It redirects the light path.
A) Stethoscope
B) Altimeter
C) Hydrometer
D) Periscope
Answer: D
Explanation: Periscope means a viewing instrument using mirrors or prisms to see over an obstacle. It redirects the light path.
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