Physics, asked by SaaraSheikh, 8 months ago

A student finds the writing on the blackboard as
blurred and unclear when sitting on the last desk of
the classroom. He however sees clearly when sitting
on the front desk at an approximate distance 2 m
from the blackboard.
(i) Draw the ray diagram to illustrate the formation
of image of the blackboard writing by his eye
lens when he sits at the (a) last desk, (b) front
desk.
(ii) Name the defeuct of vision the student is
suffering from. Also, list two causes of this
defect.
iii) Name the kind of lens that would enable him to
see clearly when he is seated at the last desk.
Draw the ray diagram to illustrate how this lens
helps him to see clearly.

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Answers

Answered by amaravathi151018

Answer:

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Explanation:

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Arithmetic function

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This article is in list format, but may read better as prose. (July 2020)

In number theory, an arithmetic, arithmetical, or number-theoretic function[1][2] is for most authors[3][4][5] any function f(n) whose domain is the positive integers and whose range is a subset of the complex numbers. Hardy & Wright include in their definition the requirement that an arithmetical function "expresses some arithmetical property of n".[6]

An example of an arithmetic function is the divisor function whose value at a positive integer n is equal to the number of divisors of n.

There is a larger class of number-theoretic functions that do not fit the above definition, for example, the prime-counting functions. This article provides links to functions of both classes.

Arithmetic functions are often extremely irregular (see table), but some of them have series expansions in terms of Ramanujan's sum.

Multiplicative and additive functions

Notation

Ω(n), ω(n), νp(n) – prime power decomposition

Multiplicative functions

Completely multiplicative functions

Additive functions

Completely additive functions

Neither multiplicative nor additive

Summation functions

Dirichlet convolution

Relations among the functions

First 100 values of some arithmetic functions

Notes

References