MHT CET 2018 Physics Solved Paper

(b) According to question,

Let 'x' be the distance of source from the surface of glass slab time taken to travel light, from source to surface of the glass slab, (t1) = time taken to travel in glass slab (t2)
t1=

x

3×108

and, t2=

5

3×108 1.6

[∵ Velocity of light in glass medium, =

C

M

]
∴

x

3×108

=

5

3×108 1.6

or, x = 5 × 1.6 = 8.0 cm