JEE Main & Advanced
Physics
Ray Optics
Question Bank
Refraction of Light at Plane Surfaces
question_answer
A plane glass slab is kept over various coloured letters, the letter which appears least raised is [J & K CET 2004; BHU 1998, 05]
A) Blue
B) Violet
C) Green
D) Red
Correct Answer:
D
Solution :
\[\mu =\frac{h}{{{h}'}}\Rightarrow {h}'\propto \frac{1}{\mu }\] \[\because {{\mu }_{R}}<{{\mu }_{V}}\] so \[{{{h}'}_{R}}>{{{h}'}_{V}}\] i.e. Red colour letter appears least raised.