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3 years ago

What are the cause of eye strain during computer usage?

Computers and Technology

1 answer:

Natasha2012 [34]3 years ago

5 0

It happens because your eyes follow the same path over and over. And it can get worse the longer you continue the movement. When you work at a computer, your eyes have to focus and refocus all the time. They move back and forth as you read. You may have to look down at papers and then back up to type. Your eyes react to changing images on the screen to create so your brain can process what you’re seeing. All these jobs require a lot of effort from your eye muscles. And to make things worse, unlike a book or piece of paper, the screen adds contrast, flicker, and glare.

You’re more likely to have problems if you already have eye trouble, if you need glasses but don't have them, or if you wear the wrong prescription for computer use.

Computer work gets harder as you age and the lenses in your eyes becomes less flexible. Somewhere around age 40, your ability to focus on near and far objects will start to go away. Your eye doctor will call this condition presbyopia.

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For the following 4-bit operation, assuming these register are ONLY 4-bits in size, which status flags are on after performing t

m_a_m_a [10]

Answer:

All flags are On ( c, z , N )

Explanation:

Given data:

4-bit operation

Assuming 2's complement representation

<u>Determine status flags that are on after performing </u> 1010+0110

1 1

1 0 1 0

0 1 1 0

1 0 0 0 0

we will carry bit = 1 over

hence C = 1

given that: carry in = carry out there will be zero ( 0 ) overflow

hence V = 0

also Z = 1

But the most significant bit is N = 1

8 0

3 years ago

Assume that ip has been declared to be a pointer to int and that enrollment has been declared to be an array of 20 elements . As

Vitek1552 [10]

Answer:

ip = enrollment + section;

Explanation:

The variable ip has been declared to be a pointer to int.

int * ip;

The variable enrollment has been declared as an array of 20 elements .

int enrollment[20];

The variable section has been declared as an int.

int section;

In order to make ip point to the element in the array indexed by section, we can use the following statement :

ip = enrollment + section;

This will make ip point to enrollment[section].

5 0

3 years ago

Describe how you would define the relation Brother-in-Law whose tuples have the form (x, y) with x being the brother-in-law of y

damaskus [11]

Answer:

The expression is :

π[cd) + π(g,h) ],[π(e,f)+π(a,b)])

We will use foreign key and primary key

8 0

3 years ago

c++ 2.30 LAB: Phone number breakdown Given a long long integer representing a 10-digit phone number, output the area code, prefi

Nady [450]

Answer:

#include <iostream>

using namespace std;

int main()

{

//declare variable to store phone numbers,its area code, prefix and line number.

long phone_number;

int area_code, prefix,line_number;

cout<<"Enter 10-digit phone number:"<<endl;

//input 10-digit phone number

cin>>phone_number;

//logic to find area_code, prefix, and line_number.

area_code = phone_number/10000000;

prefix = (phone_number/10000)%1000;

line_number = phone_number%10000;

//output phone number in asked format.

cout<<area_code<<"-"<<prefix<<"-"<<line_number<<endl;

return 0;

}

Output:

Enter 10-digit phone number:

8005551212

800-555-1212

Explanation:

In the above program 10 digit phone number entered by user will be stored in the variable phone_number.

Then using this phone_number variable area_code, prefix, and line number are calculated using the following logic:

area_code = phone_number/10000000;

prefix = (phone_number/10000)%1000;

line_number = phone_number%10000;

Finally these area_code, prefix, and line_number are displayed with hyphen in between using cout statement.

5 0

3 years ago

Which of the following are examples of software? (Select all that apply)

olchik [2.2K]

Put a photo or something

8 0

2 years ago

Read 2 more answers