1
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is :
A
1.83 $$ \times $$ 10-7 rad
B
7.32 $$ \times $$ 10-7 rad
C
6.00 $$ \times $$ 10-7 rad
D
3.66 $$ \times $$ 10-7 rad
2
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is $$\mu $$, then the angle of incidence is nearly equal to :
A
$${{2A} \over \mu }$$
B
$$\mu $$A
C
$${{\mu A} \over 2}$$
D
$${A \over {2\mu }}$$
3
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
In Young's double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :
A
half
B
four times
C
one-fourth
D
double
4
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence having surface area 20 cm2. The energy received by the surface during time span of 1 minute is :
A
12 $$ \times $$ 103 J
B
24 $$ \times $$ 103 J
C
48 $$ \times $$ 103 J
D
10 $$ \times $$ 103 J
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