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Lunar eclipse is the complementary phenomenon to solar eclipse. Option A is wrong. When Moon comes between Sun and Earth it causes SOLAR eclipse not lunar eclipse. This is the exact opposite condition. Solar eclipse = Moon blocks Sun from Earth. Option B is wrong. The Sun cannot physically come between Earth and Moon in this context. The Sun is the central star far from both Earth and Moon. This configuration is physically unrealistic in the solar eclipse context. Option C is CORRECT. The image states: चन्द्र ग्रहण (Lunar Eclipse) की घटना होती है — जब सूर्य एवं चन्द्रमा के मध्य पृथ्वी आ जाती है. Lunar eclipse occurs on a full moon night (Poornima) when Earth comes between the Sun and Moon. Earth's shadow falls on the Moon darkening it. During total lunar eclipse the Moon appears reddish (Blood Moon) because Earth's atmosphere refracts red light toward the Moon. Types: Total lunar eclipse (Moon fully in Earth's umbra). Partial lunar eclipse (Moon partially in Earth's umbra). Penumbral lunar eclipse (Moon in penumbra only — barely visible). Option D is wrong. Earth moving closer to Moon is orbital variation (perigee vs apogee) and does not cause lunar eclipse. Eclipse requires specific alignment.
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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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