Question

According to Newton's corpuscular theory, the speed of light is

• A. lesser in rarer medium
• B. same in all the medium
• C. lesser in denser medium
• D. independent of the medium

Answer 1

The correct option is A

lesser in rarer medium

Correct option is A: lesser in rarer medium

Explanation for the correct option:

1. The Newton’s theory of refraction concludes that “velocity of light in air medium is less than velocity of light in denser medium.”
2. For example, for visible light, the refractive index of glass is typically around $1.5$, meaning that light in glass travels at $200000km/s$and the refractive index of air for visible light is about $1.0003$, so the speed of light in air is about $90km/s$.

Hence, 'Option A' is correct and rest all are incorrect.