The speeds of light in four transparent media P, Q, R and S are ,

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

The speeds of light in four transparent media P, Q, R and S are

2.25\times10^{8}\,\text{m s}^{-1}

1.80\times10^{8}\,\text{m s}^{-1}

2.00\times10^{8}\,\text{m s}^{-1}

and

2.40\times10^{8}\,\text{m s}^{-1}

respectively. Which sequence gives the correct order of increasing optical density (least to greatest)? (a)

Q,\;R,\;P,\;S

(b)

S,\;R,\;P,\;Q

(c)

S,\;P,\;R,\;Q

(d)

S,\;P,\;Q,\;R