NEET 2020 Phase 1 | Geometrical Optics Question 23 | Physics

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?

equal to angle of incidence

90^o

180^o

0^o

NEET 2019

MCQ (Single Correct Answer)

-1

Pick the wrong answer in the context with rainbow.

An observer can see a rainbow when his front is towards the sun.

Rainbow is a combined effect of dispersion refraction and reflection of sunlight.

When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed.

The order of colours is reversed in the secondary rainbow.

NEET 2019

MCQ (Single Correct Answer)

-1

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 :

1 : 2

2 : 3

3 : 4

2 : 1

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