What does “Refraction & refractive index” actually mean in Ray Optics & Optical Instruments, and why does it matter for NEET?
light bends when it changes medium because its speed changes; n = c/v, and it bends toward the normal entering a denser medium.
In simple words: light bends when it changes medium because its speed changes; n = c/v, and it bends toward the normal entering a denser medium. Getting Refraction & refractive index clear matters because NEET questions on Ray Optics & Optical Instruments usually test this idea directly, not just a formula you memorised.
Key point
Refraction & refractive index
Common mistake
thinking light bends because it slows and 'wants' to take the short path only in glass.
Memory tip
denser medium → slower light → bends toward the normal.
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