Light and sight - class-X

The total internal reflection occurs when the ray of light is reflected totally into the same medium even without the presence of a mirror. The total internal reflection occurs when a ray of light travels from denser medium to rarer medium.

Given $\angle i=70^o$
The angle between incident ray and the reflected ray $=2\angle i=140^o$

Periscope, mirror, side mirror of a car use the reflection of light phenomenon.

An ideal mirror is defined as object having a reflecting surface so smooth that it reflect back all the light rays striking without any absorbance and emiittance.

Myopia is the inability to see objects clearly when they're too far away. People with myopia can often read or see items within a few feet of their face, but distant objects appear blurred. This condition usually develops in an eyeball that's too long from front to back.

The ocean looks blue because red, orange and yellow (long wavelength light) are absorbed more strongly by water than is blue (short wavelength light). So when white light from the sun enters the ocean, it is mostly the blue that gets returned.

It is a fact that laws of reflection are applicable to all reflecting surfaces.

Shaving mirrors are concave mirror, so that when you keep your face near to the focus of the mirror, you get a magnified image.

if angle with the mirror = $30^o$ then angle with the normal = $90^o - 30^o$ = 60$^o$

Angle of deviation is defined as the angle between incident ray and emergent ray or reflected ray.

$ \bf{Refraction} $ of light is the phenomenon of bending of light or change in the direction of light, when it passes obliquely from one transparent medium to another.

$ \bf{Reflection} $ is the phenomenon in which light rays on striking a polished surface(such as a mirror) bounce back or are sent back into the same medium. 

$\bf{Dispersion} $ is the phenomenon of splitting of white light into its component colours (VIBGYOR) on passing through a glass prism.

$\bf{Scattering} $ is the phenomenon by which a beam of light is redirected or deflected in many different directions, when it passes through an imperfect medium, due to interaction with the particles of the medium.

Hence, the correct answer is OPTION B. 

According to the laws of reflection, the angle of incidence made by the incident ray with the normal must be equal to the angle of reflection made by the reflected ray with the normal i.e.  $i=r$. So, the given statement is true.

Reflection is the phenomenon by which the incident light falling on a surface is sent back into the same medium.

According to laws of reflection angle of incidence is equal to angle of reflection, hence of $60^{0}$ angle of incidence, angle of reflection is also $60^{0}$.

When light travels from air Into water, Its speed decreases.

Polished glass of red colour reflects some of the light incident on it so images of the both persons are formed on it.

Reflection is bouncing back of ray of light.  

When light passes from one medium to another, it only continues in a straight line without refraction if the angle of incidence is 0 degrees (normal incidence).