State the laws of refraction.

Explain Raman Scattering.

Write the sign convention for lenses.

Explain the Sign Conventions of lenses.

Explain the working of the eye.

Explain the construction of Simple Microscope and derive its magnification power.

Explain the types of Telescope.

Explain the refraction of light through a glass prism.

A girl playing with a thin beam of light from her laser torch by directing it from different directions on a convex lens held vertically. She was surprised to see that in a particular direction the beam of light continues to move along the same direction after passing through the lens. State the reason for this observation.