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1
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
The Brewster's angle ib for an interface should be :
A
30$$^\circ $$ < ib< 45$$^\circ $$
B
45$$^\circ $$ < ib< 90$$^\circ $$
C
ib = 90$$^\circ $$
D
0$$^\circ $$ < ib< 30$$^\circ $$
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1m away, was found to be 0.2o. What will be the angular width of the first minima, ($$\mu $$water = 4/3) if the entire experimental apparatus is immersed in water?
A
0.15o
B
0.05o
C
0.1o
D
0.266o
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?
A
equal to angle of incidence
B
90o
C
180o
D
0o
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Pick the wrong answer in the context with rainbow.
A
An observer can see a rainbow when his front is towards the sun.
B
Rainbow is a combined effect of dispersion refraction and reflection of sunlight.
C
When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed.
D
The order of colours is reversed in the secondary rainbow.
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