angular aperture Directory References Discover Timeline of the September 11 Attacks 11 Egyptian Gods and Goddesses Titanosaurs: 8 of the World's Biggest Dinosaurs Timeline of the American Civil Rights Movement What’s the Difference Between a Turtle and a Tortoise? 10 Greatest Baseball Players of All Time How Deadly Is Quicksand? Contents Ask the Chatbot a Question angular aperture optics Ask the Chatbot a Question Learn about this topic in these articles:definition In aperture…object point is called the angular aperture, which can be taken as a measure of the light-gathering power of the instrument. See also pupil; relative aperture.Read More Britannica ChatbotChatbot answers are created from Britannica articles using AI. This is a beta feature. AI answers may contain errors. Please verify important information using Britannica articles. About Britannica AI.