Which of the following are luminous objects? Mars, Moon, Pole Star, Sun, Venus, Mirror
Sun and Pole Star are luminous objects. The Sun is the main source of natural light on Earth and emits its own light. The Pole Star is a star that also emits its own light. Mars, Moon, and Venus are non-luminous objects as they do not emit their own light but reflect light from the Sun. A mirror is also non-luminous as it only reflects light that falls on it.
Explanation
The chapter explains in section 11.1 that objects which emit their own light are called luminous objects, while objects that do not emit their own light are called non-luminous objects. The Sun and stars (including the Pole Star) are luminous objects because they produce their own light. The Moon, planets like Mars and Venus, and mirrors are non-luminous because they only reflect light from other sources.