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A bubble in glass slab ($\mu$ = 1.5) when viewed from one side appears at 5 cm and 2 cm from other side, then thickness of slab is :
A
3.75 cm
B
3 cm
C
10.5 cm
D
2.5 cm
Detailed Solution
Real depth = $\mu \times$ apparent depth.
From the first side: real depth of the bubble $= 1.5 \times 5 = 7.5$ cm
From the other side: real depth $= 1.5 \times 2 = 3$ cm
Thickness of the slab = sum of the two real depths $= 7.5 + 3 = 10.5$ cm
From the first side: real depth of the bubble $= 1.5 \times 5 = 7.5$ cm
From the other side: real depth $= 1.5 \times 2 = 3$ cm
Thickness of the slab = sum of the two real depths $= 7.5 + 3 = 10.5$ cm