Ray Optics and ...

A ray of light falls on the surface of a spherical glass paperweight making an angle $$a$$ with the normal and is refracted in the medium at angle $$b$$. The angle of deviation of the emergent ray from the direction of incident ray is :

A bubble in glass slab $$(\mu = 1.5)$$ when viewed from one side appears at $$5 \ cm$$ and $$2 \ cm$$ from other side, then thickness of slab is :

A thin prism of angle $$15^{o}$$ made of glass of refractive index $$\mu _{1} = 1.5$$ is combined with another prism of glass of refractive index $$\mu _{2} = 1.75$$. The combination of the prism produced dispersion without deviation. The angle of the second prism should be :

The angle at which the ray is incident on the second mirror is___?

The imaginary line passing through the pole and the center of curvature of the curved mirror is called its _______.

The point of intersection of emergent rays is :

Why is the colour of the clear sky blue?

How can we explain the reddish appearance of sun at sunrise or sunset? 

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

Beams of light are incident through the holes A and B and emerge out of the box through the holes C and D respectively as shown in the Figure. Which of the following could be inside the box?