NEET 2020 Phase 1 | Geometrical Optics Question 24 | Physics

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-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 :

$${{2A} \over \mu }$$

$$\mu $$A

$${{\mu A} \over 2}$$

$${A \over {2\mu }}$$

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

The Brewster's angle i_b for an interface should be :

30$$^\circ $$ < i_b< 45$$^\circ $$

45$$^\circ $$ < i_b< 90$$^\circ $$

i_b = 90$$^\circ $$

0$$^\circ $$ < i_b< 30$$^\circ $$

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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