NEET 2020 Phase 1 | Geometrical Optics Question 20 | 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

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.

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