what are concave lens ??? explain in short.
Answers
Answer:
A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it.
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Question⤵
➡what are concave lens ???
Answer⤵
➡A concave lens is a type of lens that diverges a straight light beam coming from the source to a diminished, upright, virtual image is known as a concave lens. It can form both real and virtual images. Concave lenses have at least one surface curved inside. A concave lens is also known as a diverging lens because they are shaped round inwards at the center and bulges outwards through the edges, making the light diverge on it. They are used for myopia as they make faraway objects look smaller than they really are.
1.he point in the lens where the light refracts and diverges is known as the principal focus.
2.The distance between the principal focus and the center of the lens is known as the focal length.
3.If the thickness of the lens is less compared to the radius of the arc, then the lens is called a thin lens. The optical power of the lens is given by the formula:
1/f=1/v+1/u
where f is the focal length
v is the distance of the image from the center
u is the distance of the object from the center
Similarly, the magnification of the image is given by the equation,
M=hi/ho=v/u
where M is the magnification
hi is the height of the image
ho is the height of the object
Image Formation in Concave Lens:-
When an object is placed at infinity, a virtual image is formed at the focus. The size of the image is much smaller than that of the object.
When an object is placed at a finite distance from the lens, a virtual image is formed between the pole and the focus of the convex lens. The size of the image is smaller than that of the object.
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