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JEE Main 26 Feb 2021 Shift 2 Solved Paper
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© examsnet.com
Question : 9
Total: 89
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A)
For a simple microscope, the angular size of the object equals the angular size of the image.
Reason (R)
Magnification is achieved as the small object can be kept much closer to the eye than
25
c
m
and hence, it subtends a large angle.
In the light of the above statements, choose the most appropriate answer from the options given below.
[26 Feb 2021 Shift 2]
A
is true but
R
is false.
Both
A
and
R
are true but
R
is not the correct explanation of
A
.
Both
A
and
R
are true and
R
is the correct explanation of
A
.
A
is false but
R
is true.
Validate
Solution:
The formation of image with simple microscope is shown below.
Here,
θ
′
=
‌
h
u
0
=
‌
h
′
D
=
‌
h
′
25
where,
D
=
25
c
m
(least distance of distinct vision)
Here,
θ
′
is same for both object and image, hence Assertion is true.
Magnification,
m
=
‌
θ
′
θ
=
‌
D
u
0
Hence, if
u
0
<
D
(
25
c
m
)
, hence the value of
θ
′
will obtain large. So, option (c) is the correct.
© examsnet.com
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