## What is $sin(90-θ)$ and $cos(90-θ)$?

Updated on 10-Oct-2022 09:36:22

## Why is acid harmful for us?

Updated on 10-Oct-2022 09:36:02
Strong acids are corrosive in nature and are a strong dehydrating agent. When corrosive acids react with the skin, they hydrolyze the fats. Strong acids are harmful to the skin, eyes, and respiratory tract. Acids are harmful to the digestive system when swallowed.Acids react violently with water and are harmful in the presence of moisture in the mouth or eyes. Also, vapours of some acids are soluble in water and can cause damage to the human eyes, nasal passages, throat, and lungs. The above image shows a hand after 2 seconds of contact with nitric acid. Symptoms: ... Read More

## Can a myotropic eye see distant objects clearly by seeing a reflection in the plane mirror?

Updated on 10-Oct-2022 09:36:00
In a plane mirror, object distance ( u ) = Image distance ( v ) The rays that are coming from a far object when they get reflected from the mirror, these reflected rays they appear to be coming from an image (when rays are extended back) that is formed behind the mirror. So originally, these rays are coming from the same distance. Hence though the mirror gives us an illusion of the object being close to us, but actually the rays from the image are coming from the same distance as the ... Read More

## Solve 53% of 53

Updated on 10-Oct-2022 09:36:00
To solve such problems we simply replace % sign with 1/100 and 'of' will be replaced by multiplication sign so,53% of 53 will be 53 x (1/100) x 53 = 28.09