Question

*
Name:
Me
1. What is the formula of magnification 'm?
2. How many images are formed by a lens made up of three different me
3. Which lens is thin at the middle of both sides and thicker at the edges
How many focal points has there in each and every lens?
5. In which lens the real and virtual images can formed?
6. Draw the focal length of a lens is '-' then what must be the type of t
7. Observe the following statements.
(a) Focal length of a lens depends on the surrounding medium.
(b) Focal length of a lens changes with the object distance.
8. When a lens of focal length 'p' is cut into two equal halves perpendia
principal axis. What is the focal length of each part of the lens?
size of the image formed by a convex lens is same as that the​

Answer 1

Answer:

1=M=v/u

2=So the given lens have three different focal lengths. Hence it forms three images

3=A lens which is thicker in the middle and thinner at the edges is called a convex lens

4=Note that each lens has two focal points - one on each side of the lens. Unlike mirrors, lenses can allow light to pass through either face, depending on where the incident rays are coming from. Subsequently, every lens has two possible focal points.

5=Convex (converging) lenses can form either real or virtual images (cases 1 and 2, respectively), whereas concave (diverging) lenses can form only virtual images (always case 3). Real images are always inverted, but they can be either larger or smaller than the object.

6=The focal length of a lens is determined when the lens is focused at infinity. Lens focal length tells us the angle of view—how much of the scene will be captured—and the magnification—how large individual elements will be. ... The shorter the focal length, the wider the angle of view and the lower the magnification

7=a=The focal length of a lens is depended on the surrounding medium. The reason behind this phenomenon is that the angle of refraction of a lens is depended on the indices of refraction of the medium of lens and the incoming medium and the difference in their indices

b=That means that the focal point is on the same side of the lens as the light rays were coming from. In actuality, there are two focal points for every lens, the same distance from the lens, on opposite sides. The distance from the lens to the focal point is called the focal length.

8=--There will be no effect on focal length as the radius of curvature will remain same and then the focus will be same.

--Intensity of image formed will be less since the aperture of each part will be become

$\frac{1}{ \sqrt{2} }$

times of the complete lens.

Explanation:

i hope my all answer is right