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MHT CET 2018 Physics Solved Paper
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© examsnet.com
Question : 24
Total: 50
A ray of light is incident normally on a glass slab of thickness 5 cm and refractive index 1.6. The time taken to travel by a from source of slab is same as to travel through glass slab. The distance of source from the surface is
4 cm
8 cm
12 cm
16 cm
Validate
Solution:
(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,
(
t
1
)
= time taken to travel in glass slab
(
t
2
)
t
1
=
x
3
×
10
8
and,
t
2
=
5
3
×
10
8
1.6
[∵ Velocity of light in glass medium,
=
C
M
]
∴
x
3
×
10
8
=
5
3
×
10
8
1.6
or, x = 5 × 1.6 = 8.0 cm
© examsnet.com
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