Teaching UP TGT Mock Test Series 2025 Physics Optics Refraction and Reflection

The time required for the light to pass through a glass slab (refractive index = 1.5) of thickness 4 mm is _______ (c = 3 × 10⁸ ms^-1, speed of light in free space).

1

10^-11 sec

2

2 × 10^-11 sec

3

2 × 10^-12 sec

4

2 × 10^-5 sec

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