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The way light energy is transmitted is fundamental to understanding its nature. Option A is wrong. Mechanical vibrations (sound) require a physical medium like air or water for propagation. Light travels through vacuum where no material medium exists so it cannot be mechanical vibration. Option B is CORRECT. The image states: प्रकाश ऊर्जा का संरक्षण निर्वात में कैसे होता है — विद्युत चुम्बकीय तरंगों के रूप में. Light is an electromagnetic wave consisting of oscillating electric and magnetic fields that are perpendicular to each other and to the direction of propagation. These fields regenerate each other as they travel through space requiring no medium. This is why light can travel through the vacuum of space bringing the Sun's energy to Earth. Maxwell predicted this in 1865 and Hertz confirmed it experimentally in 1887. Option C is wrong. Sound waves are mechanical longitudinal waves that require a medium to travel. They cannot travel through vacuum. Light travels far faster (3×10⁸ m/s) than sound (340 m/s in air). Option D is wrong. Heat energy is the thermal energy of molecules in random motion. While light can be converted to heat (absorption) this is not how light energy is transmitted during propagation.
FAQ
Common questions and clear answers for this topic.
Optics is the branch of physics that studies the behavior of light, including its reflection, refraction, and interaction with lenses and mirrors.
Reflection is the bouncing back of light when it strikes a surface, while refraction is the bending of light as it passes from one medium to another with a different optical density.
A lens is a transparent optical device with curved surfaces that refracts light to converge or diverge rays, commonly classified as convex (converging) or concave (diverging).
The speed of light in a vacuum is approximately 3 x 10^8 meters per second, denoted by the symbol c.
Total internal reflection occurs when light traveling from a denser medium to a rarer medium strikes the boundary at an angle greater than the critical angle, causing it to be completely reflected back into the denser medium.
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