Learning Acceleration Progr
10th Class
Đt: 26.02.2021
- Write the answers for the following questions in a word or phrase. Each qu
1 What is the angle of vision for healthy human being? about 60
2 Mention the minimum focal length of human eye lens.
3 What are the sub shells are present in a principle shell n = 2? @S
4 Write the short hand notation of electronic configuration.
Write the answers for the following questions in two sentences. Each Que
5. What is the accommodation of a lens?
6. What is the power of a lens?
7. Which electronic shell is at a higher energy level K or L?
8. What is an orbital?
.Write the answers for the following questions in four sentences. Each Q
9., Doctor advised to use 2D lens? What is its focal length?
10. A person is suffering from myopia, an object is present at infinity. W
a diagram for this situation?
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Answers
Answers :1) about 60° the angle of vision for a healthy human is about 60°.it varies person to person.
2)The distance between lens and retina is 2.5cm.Minimum focal length occur when you focus on images at your nearpoint The minimum focal length of eye lens is 2.27 cm.
3)There are four orbitals in the n = 2 shell.
There is only one orbital in the 2s subshell. But, there are three orbitals in the 2p subshell because there are three directions in which a p orbital can point.
4)Explanation:
In shorthand electron configuration, the electron configuration starts with the symbol of the noble gas in the previous period, followed by the additional configuration of the electrons for the given element.
5)Explanation:
In shorthand electron configuration, the electron configuration starts with the symbol of the noble gas in the previous period, followed by the additional configuration of the electrons for the given element.
6)Power of lens is known as the inverse of the focal length of the lens measured in meter(m).
S.I unit of power = Dioptre (D)
Power of lense = 1/ focal length in meter.
The focal length of 1st lense f1 = 40 cm = 0.4 m
The lense used is a convex lens because the focal length is a positive value.
7)L shell has higher energy because according to Bohr’s theory the shell which is closer to nucleus has lower energy and the shell which is away from the nucleus has higher energy.
K is closer to nucleus. So it has lower energy than L-shell.
8)An orbital is a three dimensional description of the most likely location of an electron around an atom. Below is a diagram that shows the probability of finding an electron around the nucleus of a hydrogen atom. Notice that the 1s orbital has the highest probability.
9)power of lens is 2D
we know power is the reciprocal of focal length in metres
p=1/f
2=1/f
f=1/2m
so the focal length is 0.5
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