First slide

Ray optics

Question

A monochromatic light passes through a glass slab ( $μ$ = 1.5) of thickness 9 cm in time t₁. If it takes a time $t_{2}$ to travel the same distance through water ( $μ$ = 4 /3) . The value of (t₁- t₂) is

Moderate

A

5 × 10^–11 sec
B

5 × 10^–8 sec
C

2.5 × 10^–10 sec
D

5 × 10^–10 sec

Solution

$∆ t = (\frac{μ_{g} d}{C} - \frac{μ_{w} d}{C}); (\frac{3}{2} - \frac{4}{3}) \frac{9 x 10^{- 2}}{3 x 10^{8}} = 5 x 10^{- 11} \sec$

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