MHT CET Physics question
A ray of light is incident normally on a glass slab of refractive index '' of thickness '' which is at a distance x from the glass. The ray of light takes same time to reach from source to slab and to pass through the slab. The thickness of the slab is
Answer: (B)
Solution
Time to reach the slab ; time inside the slab ; equating gives . Hence the correct option is (b).