Answer: Option B. -> A myopic person can see near objects clearly
:
B and C

Myopia means shortsightedness. The person suffering from myopia can see nearby things clearly but the distant objects appears blurry. This is generally caused by two factors:

i. increase in the size of the eye-ball

ii. defect in the eyelens.

In both cases, the image is formed in front of the retina, instead of forming on the retina. 

Answer: Option B. -> Dispersion
:
B

Splitting of light into its constituent colours is known as dispersion of light. This happens through multiple refractions where the constituent colours of light deviate at different angles.

Answer: Option B. -> It makes things around us visible.
:
A, B, and C

Light is a form of energy. It is because of light that we are able to see the things around us. Thus makes things around us visible. A ray of light travels in a straight line as long as it is in one medium. However, light doesn't have mass.

Answer: Option B. -> False
:
B
Rods enable vision at low light levels. Cones on the other hand enable perception of colour.

Answer: Option C. -> It is caused by the decrease in the size of an eyeball
:
C and D

Hypermetropia means longsightedness. The person suffering from hypermetropia can see distant objects clearly but  the near objects appear blurry ( reading newspaper or a book). This is generally caused by two factors:

i. Decrease in the size of the eye ball

ii. Decrease in the power of the eye lens

.

Answer: Option B. -> 5
:
B

Whenever two plane mirrors are kept inclined to each other, multiple reflections takes place and multiple images are formed. 

If the angle of inclination between two plane mirrors is '$x$' degrees, the number of images formed, '$\text{n}$' is given by,
$\text{n}=\frac{360}{\text{x}}-1$
In this case, $\text{x}$ = 60 degrees.
$\text{n}=\frac{360}{\text{60}}-1$
$\text{n}=\text{6}-1$
$\text{n}=\text{5}$
 
Thus, the number images formed is 5.

Answer: Option B. -> False
:
B

Reflection of light from a rough surface is called irregular reflection of light for e.g. a rock, sand, rough wooden table,etc. From this kind of surface, a ray incident on the surface is scattered at many angles rather than at just one angle.

Answer: Option B. -> False
:
B

Blind persons can read and write by using the Braille script. Braille was developed to help visually challenged people read by moving their fingers on impressions made on paper. In Braille, there are definite impressions for all letters which a blind person can feel through his fingertips and recognize .

Answer: Option C. -> They all lie in the same plane.
:
C

From the laws of reflection, we know that the incident ray, the reflected ray and the normal all lie in the same plane.

Answer: Option A. -> Kaleidoscope
:
A and B
Kaleidoscope and periscope works on the principle of multiple reflection.
1)Kaleidoscope : It has 3 long mirrors put together in form of an equilateral triangle. The set of mirrors is put inside a box of almost similar size. The box contains pieces of marbles at its bottom whic get reflected in the mirrors. Since the mirrors form an equilateral triangle with each of the mirror piece inclined with each other at ${60}^{\circ }$ angle, the marble pieces get reflected a lot of times and form multiple images in the mirrors.

2)Periscope:
It is a device used for viewing objects higher than our field of vision. As shown in the image, two square shaped small mirrors are placed at angle of ${45}^{\circ }$ in a cuboid box. The light comes in through the higher window falling and reflecting from the top mirror and falling on the bottom mirror. From the bottom mirror light is reflected to the observer and the observer is able to see object which is in front of top mirror window.