Under what condition, is a convex lens nearly acts as diverging lens?
Answer: Condition 1:
A convex lens can behave as a diverging lens when it is placed in a medium whose refractive index is greater than the refractive index of the material of the lens.
Example: A convex lens of glass (n= 1.5) behave as a diverging lens when immersed in carbon disulphide of higher refractive index (n=1.6).
Condition 2:
When an object is placed inside the focal length of a convex lens, the rays do not converge to the opposite side of the lens, in this case convex lens acts as diverging lens.
Lens:
A lens is a device that focuses or disperses a beam of light by refraction.
Types of Lenses:
Lenses are of two main types:
i. Convex Lens ( Converging Lens ) : If a lens is thicker at the center than the edges, it is called convex lens or converging ( since parallel rays will be converged to meet at the focus ).
ii. Concave Lens ( Diverging Lens ) : A lens which is thinner in the center than the edges is called concave lens or diverging lens ( since rays going through it will be spread out ).