Practice question

Given: A glass slab ( n = 1.5 ) of thickness 7.5 cm is placed over a point. What is the apparent shift? These values define the system as per NCERT data. Formula: Shift = t ( 1 - 1/n ). This is the standard NCERT relation for this phenomenon. Substitution & Calculation: t = 7.5 cm, n = 1.5 . Shift = 7.5 ( 1 - 1/1.5 ) = 7.5 ( 1 - 2/3 ) = 7.5 × 1/3 = 2.5 cm . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.