Home › UP Board Class 10 › physics › c10refractionlenses › Per NCERT, what is the speed of light in a VACUUM?
Per NCERT, what is the speed of light in a VACUUM?
ALight has no speed
B3 × 10¹⁰ m/s
C3 × 10⁶ m/s
D3 × 10⁸ m/s
Answer & Solution
Correct answer: D. 3 × 10⁸ m/s
Per NCERT §9.3.2, c = 3 × 10⁸ m/s in vacuum (and marginally less in air).
Related questions
Per NCERT, a CONCAVE LENS forms what kind of image — regardless of object position?Per NCERT, a CONVEX LENS forms what kind of image when an object is placed BEYOND 2F₁?Per NCERT §9.3.3, what is the OPTICAL CENTRE of a lens?Per NCERT, kerosene (n = 1.44) is OPTICALLY DENSER than water (n = 1.33) — though kerosenePer NCERT, what is the refractive index of DIAMOND — the HIGHEST among the common materialPer NCERT Table 9.3, what is the refractive index of WATER?Per NCERT, the ABSOLUTE REFRACTIVE INDEX of a medium (nm) is defined as which RATIO?Per NCERT, in refraction through a RECTANGULAR GLASS SLAB, what is the relationship betwee