A concave lens is used to correct myopia (nearsightedness) by diverging light rays before they enter the eye, helping to focus the image properly on the retina. It can also be used in optical devices like microscopes and cameras to spread out light rays.
You would use a concave mirror to view an enlarged image of an object. Concave mirrors can focus light rays to create a magnified image that appears larger than the actual object.
A convex lens would be used to magnify an object because it converges light rays to a focal point, thereby creating a larger and more magnified image. A concave lens diverges light rays and would not be suitable for magnifying objects.
In case of concave lens the edges will be thicker compared to the central part. Whereas the convex lens has edges so thin compared to the central part. Concave lens would have only divergence effect. Parallel beam of light falling on one side of the concave lens after refraction would come out from the other side diverging out and so they appear to come from a point on the incident side of lens. So no real image is obtained. Thus the image will be a virtual image. If converging rays fall on the concave lens after refraction may be still converging but it convergence will be reduced a little bit and so instead forming a real image nearby the concave lens it will be formed somehow far away from the lens.
A prism acts like a piece of glass that has two flat, non-parallel surfaces. Each surface of a prism behaves like a lens - one surface is concave and the other is convex. The combined effect of these surfaces is to bend light as it passes through the prism.
You would use a concave mirror, as it can focus light to a point. For starting a fire, you would use a concave mirror known as a “solar concentrator.” The paper should be held at the focal point of the mirror to maximize the concentration of sunlight and create enough heat to ignite the paper.
A concave mirror would focus the light back towards the focal point of the mirror. You would not be able to use the mirror effectively with a concave.
You would use a convex lens.
For what prupose? If it is for a shaving mirror then concave mirror would produce a magnified image which would be helpful for clean shaving.
You would use a concave mirror to view an enlarged image of an object. Concave mirrors can focus light rays to create a magnified image that appears larger than the actual object.
why do we use concave mirror as converging mirror
Concave
If it were a perfect heptagon then it would be convex. If it had any indentations then it would be concave.
Concave lenses are used todiverge rays of light.
A concave lens is thinner at the centre. People who are short sighted often use a concave lens to help them see better.
The melon was so rotten that it became concave when it was pressed on.
No, you would need at least 4 points to create a concave polygon.
a concave lens is thin in the middle, but thick on the sides. It does this: it makes what you look at bigger because it spreads out light