Question

In the image given below redraw the diagram and show the direction of the light ray after refraction from the lens.

Answer 1

-Rarer medium has less density than denser medium.
-When light rays travel from rarer medium to the denser medium the rays of light bend toward the center of the normal ray.
-When light rays travel from denser medium to the rarer medium the rays of light bend away from the center of the normal rays.

Complete step-by-step solution:
The lens is an optical device refracting medium bounded by the two surfaces, at least one of which is a curved surface. There are two types of lenses:

-Convex or converging lens: It is the combination of two plano-convex lenses where the plane side is joined together therefore, the center is thicker than the edges. Due to the refraction phenomenon, the light parallel beams converge through it.

-Concave or diverging lens: It is the combination of two plano-concave lenses where the plane sides are joined together therefore, the center is thinner than the edges. Due to the refraction phenomenon, the light parallel beams diverge through it.

-When light rays travel through the optical center then it will go in the same direction without any deviation (path change).

This is the required diagram.

Note:
-For a convex lens, it has a real focus.
-For a concave lens, it has a virtual focus.
-When light travels from rarer to the denser medium, the image formed is real.
-When light travels from denser to the rarer medium, the image formed is virtual.
-The direction of light in which it travels is always taken as positive and the opposite direction of light is taken as a negative value.