दंत चिकित्सकों द्वारा मरीजों के दांतों का बड़ा प्रतिबिंब देखने के लिए किस दर्पण का उपयोग किया जाता है?

When an object is placed at 2F (twice the focal length) in front of a thin convex lens, the image formed is:

Arrange the following optical discoveries/theories in correct chronological order: I. Wave theory of light (Huygens) II. Particle theory / Corpuscular theory (Newton) III. Interference of light (Young) IV. Photoelectric effect explanation (Einstein)

Shadows are formed when an _______ object comes in the path of light.

The blue color of the clear sky is primarily due to ______.

Which of the following is NOT an example of refraction of light?