8. Write any one difference between convex lens and concave lens.
Answers
Answer:
A convex lens or converging lens focuses the light rays to a specific point whereas a concave lens or diverging lens diverges the light rays.
Answer:
Basis for Comparison between Concave Lens Convex Lens are
As known : Diverging lens Converging lens.
Shape of the optical surface: In concave lens, the centre of the glass piece is thin while the edges are thick. In convex lens, the centre of the glass piece is thick whereas the edges are thin.
Polarity of focal length: Negative, thus sometimes referred as negative lens. Positive, hence another name used for it is positive lens.
Behaviour : It diverges the light rays. It converges the light rays.
Presence of focal point: On the side of lens from where the rays are falling. On the opposite side of the lens from where the rays are falling.
Type of image formed: Always forms virtual and erect image. Generally, forms real and inverted image.
Vision defect : It is used to correct Myopia It is used for the correction of hypermetropia.
View : Farther and smaller than the actual entity. Nearer and larger than the original entity.
Example : Lens in human eye, microscope, telescope, etc. Flash lights of vehicles, lasers and peepholes of doors.