1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
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.
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is F1. When the space between the two lenses is filled with glycerin (which has the same refractive index (m = 1.5) as that of glass) then the equivalent focal length is F2. The ratio F1 : F2 will be :
A
1 : 2
B
2 : 3
C
3 : 4
D
2 : 1
3
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
The refractive index of the material of a prism is $$\sqrt 2 $$ and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is
A
600
B
450
C
300
D
zero
4
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be
A
30 cm away from the mirror
B
36 cm away from the mirror
C
30 cm towards the mirror
D
36 cm towards the mirror
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