Question

A glass $(n_g=1.5)$ block of thickness $2.7cm$ is placed on a postage stamp. What would be the apparent depth of the stamp if it is viewed. Obliquely above the glass slab ?

• A. $0.9cm$
  
• B. $1.8cm$
  
• C. $2.4cm$
  
• D. $3.6cm$
  

Answer 1

Answer: (B)

$1.8cm$

When object is viewed obliquely from the glass surface.

then there is rise in the depth of object depends on the refractive index of glass

$refractiveindex=\frac{actualdepth}{apparentdepth}\mu =\frac{d_{actual}}{d_{apparent}}1.5=\frac{2.7}{d_{apparent}}\Rightarrow d_{apparent}=1.8cm$