Single Choice

Pick the wrong answer in the context with rainbow.

AWhen the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed
BThe order of colours is reversed in the secondary rainbow
CAn observer can see a rainbow when his front is towards the sun
Correct Answer
DRainbow is a combined effect of dispersion refraction and reflection of sunlight

Solution

Rainbow can't be observed when observer faces towards sun.
As Rainbow is a combined effect of dispersion refraction and reflection of sunlight.

SIMILAR QUESTIONS

Optics

In total reflection when the angle of incidence is equal to the critical angle then angle of refraction is?

Optics

Consider the ray diagram for the refraction given below. The maximum value of angle 6 for which the light suffers total internal reflection at the vertical surface, is

Optics

Figure shows, a glass prism $$ABC$$ (refractive index $$1.5$$), immersed in water (refractive index $$4/3$$). A ray of light incident normally on face $$AB$$. If it is totally reflected at face $$AC$$ then :

Optics

Which of the following graphs will represent the angle of deviation $$\delta$$ by a versus angle of incident $$i$$ for a monochromatic light ?

Optics

A drop of liquid is spread on the hypotenuse of $$30^o -60^o -90^o$$ prism as shown and a ray of light incident normally on face $$AB$$ of the prism. If the refractive index of liquid is $$1.3$$, then the refractive index of prism, so that total internal reflection take place is :

Optics

If a crown glass prism of refracting angle $$10^o$$ have refractive indies for red and violet rays $$1.514$$ and $$1.523$$ respectively, then the dispersion caused by a crown glass prism is :

Optics

Find the minimum and maximum deflection angles for a light ray passing through a glass prism with refracting angle $$ \theta=60^{\circ} $$

Optics

A trihedral prism with refracting angle $$ 60^{\circ} $$ provides the least deflection angle $$ 37^{\circ} $$ in air. Find the least deflection angle of that prism in water.

Optics

The refractive index of material of a prism of angles $$45^o, -45^o-90^o$$ is $$1.5$$. The path of the ray of light incident normally on the hypotenuse side is shown in

Optics

Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these for mean rays are $$1.602$$ and $$1.500$$ respectively. Angle of prism of flint prism is $$10^{o}$$, then the angle of prism for crown prism will be

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