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BITSAT 2017 Slot 2 Solved Paper
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© examsnet.com
Question : 3
Total: 150
3. The focal length of a thin convex lens for red and bluerays are 100 cm and 96.8 cm respectively. Then, the dispersive power of the material of the lens is
0.968
0.98
0.0325
0.325
Validate
Solution:
We have,
f
r
−
f
b
=
ω
f
y
ω
=
f
r
−
f
b
f
y
Here,
f
r
=
100
c
m
f
b
=
96.8
c
m
f
y
=
√
f
b
×
f
r
=
√
96.8
×
100
=
98
c
m
∴ Dispersive power
ω
=
f
r
−
f
b
f
y
=
100
−
96.8
98
=
3.2
98
=
0.0325
© examsnet.com
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