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Standard X
Physics
Telescope
Resolving pow...
Question
Resolving power of a microscope can be increased, if
A
light colour changes from red to blue
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B
light colour changes from blue to red
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C
Oil is filled between objective lens and object
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D
Both
(
A
)
and
(
C
)
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Solution
The correct option is
D
Both
(
A
)
and
(
C
)
The resolving power of a microscope is,
R
P
=
2
μ
sin
θ
1.22
λ
Where,
μ
=
Refractive index of medium between object and objective lens
θ
=
Angular resolution (in radians)
λ
=
Wavelength of the light
⇒
R
P
∝
μ
and
R
P
∝
1
λ
Since, we know that red light has higher wavelength as compare to blue. Thus, blue light will increase the value of
R
P
.
Since value of
μ
increases due to oil, so
R
P
will increase.
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence,
(
D
)
is the correct answer.
Why this question?
Key concept : Resolving power of a microscope is inversely proportional to the wavelength of light used.
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