2. Solved Papers
  3. AFMC

AFMC AFMC Solved Paper-2004

  • question_answer
    A glass slab of thickness 12 mm is placed on a table. The lower surface of the slab has a black spot. At what depth from the upper surface will the spot appear when viewed from above? (Refractive index of glass = 1.5)

    A) 2 mm                                    

    B) 4 mm

    C) 6 mm                                    

    D) 8 mm

    Correct Answer: D

    Solution :

    \[\text{Refractiv index ( }\!\!\mu\!\!\text{ ) = }\frac{\text{Real}\,\text{depth}}{\text{Apparent}\,\text{depth}}\] \[\mu =\frac{12}{\text{Apparent depth}}\] \[1.5=\frac{12}{\text{Apparent depth}}\] \[\Rightarrow \]   \[\text{Apparent}\,\text{depth =}\frac{\text{12}}{\text{1}\text{.5}}\text{= 8 mm}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner