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Bioluminescence is an interesting natural phenomenon. Option A is wrong. Sources that generate light using electricity are called electric or artificial sources (like electric bulbs LEDs tube lights). These are man-made luminescent sources using electrical energy not biological processes. Option B is CORRECT. The image states: जैव प्रकाश स्रोत (Bio Luminescent source) क्या है — ऐसे जीव जो प्रकाश का उत्सर्जन करते हैं (जैसे — जुगनू (firefly)). Bioluminescent sources are living organisms that produce and emit light through biochemical reactions occurring within their bodies. The light is produced by the reaction of a chemical called luciferin with oxygen catalyzed by the enzyme luciferase. Examples: Firefly (जुगनू) — the most well-known example. Deep sea fish (anglerfish jellyfish). Some bacteria and fungi. Plankton (causes sea to glow at night). No external energy source is needed — the organism converts chemical energy directly to light. Option C is wrong. Chemical lamps (like UV fluorescent lamps) are artificial laboratory devices not living organisms. They produce UV light through electrical excitation of gases not biological reactions. Option D is wrong. A mirror that reflects sunlight is not a light source at all — it is a reflector. Bioluminescent organisms generate their OWN light internally.
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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