A plane glass plate is placed over various coloured letters (violet, green, yellow, red). The letter which appears to raise more is

Step-by-step solution

∵ μ = R e a l d e p t h a p p a r e n t d e p t h Where, μ refractive index of medium ⇒ A p p a r e n t d e p t h = R e a l d e p t h μ But, μ ∝ 1 λ ∵ λ v < λ g < λ y < λ r Thus, μ v is greater to all of them ∴ Apparent depth is minimum for violet. It means that the violet letter appear raised more.