Question

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

• A. Red
• B. Yellow
• C. Green
• D. Violet

Answer 1

The correct option is D Violet

Normal shift through glass plate of thickness $t$.
$$d=t[1-\frac{1}{\mu }]$$
Now, Refractive index ($\mu$) is related to wavelength ($\lambda$) of light as
$$\mu =A+\frac{B}{{\lambda }^2}$$
Violet has least wavelength out of the colored letters and has the greatest shift.

So, option D is correct.