Heat, Light and Sound

Heat transfer, reflection/refraction and sound waves.

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Q1 · Heat, Light and Sound · EASY
A periscope uses two plane mirrors placed at 45° angles. Which property of light enables the periscope to function correctly?
Q2 · Heat, Light and Sound · HARD
A convex lens of focal length 20 cm forms an image of an object placed 30 cm from the lens. What is the nature and position of the image formed?