निम्नलिखित में से कौन सा प्रकाश का एक प्राकृतिक दीप्त (Luminous) स्रोत है?

The light of the Sun takes about ________ minutes to reach the Earth.

Approximately how much time does sunlight take to reach the Earth's surface if the average distance between the Sun and the Earth is 1.5 × 108 km?

The magnification (m) of a spherical mirror is given by m = -v/u, where v and u are the image and object distances, respectively. Which of the following statements is correct?