If speed of light travelling R from air to a medium decreases by 40%, find the refractive index of the medium with respect to air. (1) 2.5 (2) 1.67 (3) 1.3 (4) 1.25

If speed of light travelling R from air to a medium decreases by 40%,

1.	If speed of light travelling R from air to a medium decreases by 40%, find the refractive index of the medium with respect to air. (1) 2.5 (2) 1.67 (3) 1.3 (4) 1.25
Answer» Correct option is (2) 1.67

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If speed of light travelling R from air to a medium decreases by 40%, find the refractive index of the medium with respect to air. (1) 2.5 (2) 1.67 (3) 1.3 (4) 1.25

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