12th Class
Physics
Ray Optics
Question Bank
Ray Optics Conceptual Problems
question_answer
If a plane glass slab is placed on letters of different colours, then red coloured letters appear more raised up. Why? The apparent shift caused by a slab of thickness \['t'\] is given by \[d=t\left( 1-\frac{1}{\mu } \right)\] As refractive index of glass is maximum for red light, so red coloured letters are more raised up.