Study

Daughter breastfeeds prisoned father and gets immortalized!

noreply@blogger.com (chittaranjan behera) — Mon, 12 Nov 2018 07:34:00 +0000

After looking at this photograph you might be getting lots of Negative or Positive thought in mind, but after knowing the reality of this photograph you might get tears in your eyes.

In one of the European country, an old man was sentenced to hunger death, he was put in prison. The punishment was like that he would be put on hunger until his death.

His daughter pleaded with the government to meet her father daily until his death. She was granted permission, she used to get checked by prison officers. So that she couldn’t bring any eatable items.

She can’t see the condition of her father like this. She looked at her father with the eyes of a caring mother. So, in order to make him alive, she used to feed him breast milk on daily basis.

When after so many days, the man was not dead. The security guards got suspicious and caught the girl breastfeeding her father. A case was registered against her, but her selflessness nature wins the heart of jailor and she wins the freedom of her father.

The painting is one of the Europe costliest painting. This photograph was made by European painter “Hans Sebald Beham”

This painting is available with roman charity. This painting is made to depict a relationship and caring nature of daughter towards his father. It is story of Daughter (Pero) and father (simon).

A woman is full of love and sacrifice, whatever the role she is playing in one’s life sometimes she can be mother, sister, wife etc.

This is the Memmelocke Statue at Botermarkt 17 in Ghent, Belgium. A classical sculpture on the top of a building which was once the entrance to the city prison and also the wardens house. This building is located between the Belfry and the Lakenhelle. In the crypt of the Lakenhelle the city jail was housed for almost 150 years from 1742 to 1902.

Can you choose to have a boy or girl?

noreply@blogger.com (chittaranjan behera) — Thu, 08 Nov 2018 17:03:00 +0000

You're more likely to conceive a boy if...

You have sex on the day of ovulation, as male sperm are thought to swim faster and reach the egg first.
You reach orgasm before your partner, as this releases an alkaline fluid, thought to be more male-sperm friendly than the vagina's natural acidity.
You have deep penetration during sex.
Your partner has a high sperm count. This is because male sperm are not as strong as female sperm, and so the higher the count, the more chance there is of a male sperm reaching the egg first.
You avoid sex for a week before ovulation and then only have sex once on ovulation day, to keep the sperm count high.
Your partner suggested the love-making.
You make love at night.
You make love on odd days of the month.
Your partner keeps his genitals cool by wearing boxer shorts and loose-fitting trousers.
You eat salty food, plenty of meat, fish, white flour, pasta, fresh fruit, certain vegetables, but avoid milk and dairy products, such as yoghurt and cheese, nuts, chocolate, shellfish and wholemeal bread.

You're more likely to conceive a girl if...

You have sex earlier on in your cycle, a few days before your day of ovulation. This is because female sperm are thought to be stronger and therefore last longer than male sperm, who will die off before reaching the egg.
Your partner reaches orgasm before you.
You have sex frequently to lower your partner's sperm count, and so increase the chances of the female sperm reaching the egg first.
You keep penetration shallow.
You stop having unprotected sex four to five days before ovulation, to minimise the chances of the male sperm reaching the egg first.
Your partner keeps his genitals warm by wearing close-fitting underwear and tight trousers (although this isn't likely to do his general fertility any good!)
You suggested the love-making.
You make love in the afternoon.
You make love on even days of the month.
You put a wooden spoon under your bed and a pink ribbon under your pillow.
You drink plenty of milk and eat dairy products such as cheese and yoghurt, unsalted foods, rice, pasta, certain vegetables, mineral water, limited amounts of meat and potatoes, but avoid salt and any salty foods, wine and beer, fresh fruit, spinach, tomatoes and mushrooms, chocolate, coffee and tea.

Note : For as long as we've been making babies, experienced old women have been exchanging ideas about how to increase their chances of having either a boy or a girl.

Ray Optics or Geometrical Optics

noreply@blogger.com (chittaranjan behera) — Thu, 08 Nov 2018 08:59:00 +0000

Optics - Optics is the branch of physics which involves the behavior and properties of light.

(a) A triangular prism dispersing a beam of white light. The longer wavelengths (red) and the shorter wavelengths (blue) are separated.

(b) Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.

(c) The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.

Plane Mirror - A plane mirror is a mirror with a flat (planar) reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface).

A plane mirror is made using some highly reflecting and polished surface such as a silver or aluminum surface in a process called silvering. Historically, mirrors were simply flat pieces of polished copper, obsidian, brass, or a precious metal. Mirrors made from liquid also exist, as the elements gallium and mercury are both highly reflective in their liquid state.

Ray Optics or Geometrical Optics

1. Ray Optics or Geometrical Optics In this optics, the light is considered as a ray which travels in a straight line. It states that for each and every object, there is an image.
2. Reflection Reflection is the phenomenon of changing the path of light without any change in the medium.
3. Reflection of Light The returning back of light in the same medium from which it has come after striking a surface is called reflection of light.
4. Laws of Reflection
Two laws of reflection are given as below:
(i) The angle of incidence i is equal to the angle of reflection r.
i.e. ∠i = ∠r.
(ii) The incident ray, reflected ray and normal to the reflecting surface at the point of incidence all lie in the same plane.

Laws of reflection in practical video through animation

images formed by two plane mirrors inclined at an angle θ

5. Total number of images formed by two plane mirrors inclined at an angle θ with each other is given by

Click to watch the animation of mirror image formation

Briefly described through animated video to understand & clear all your doubt.

6. Reflecting surface of a spherical mirror is a part of a hollow sphere. Spherical mirrors are of two types, (i) Concave spherical mirror (ii) Convex spherical mirror.

Practical video animation

7. Sign Convention All measurements should be taken from pole of mirror. All measurements along the direction of incident ray will be positive and opposite to incident ray are negative. All the measurements for the distances above the principal axis are taken as positive and below the principal axis are taken as negative.

Sign Convention rule

8. For a real object, u is negative whereas v is negative for real image and positive for virtual image.

9. Mirror Formula Mirror formula is a relation between focal length of the mirror and distances of objects and image from the mirror.

11. Linear Magnification The ratio of the size of the image formed by a spherical mirror I to the size of the object O is called the linear magnification produced by the spherical mirror.

12. Magnification (m) It is negative corresponding to real image and positive for virtual image.
13. Refraction The phenomenon of changing in the path of light as it goes from one medium to another is called refraction.
14. Laws of Refraction

Two laws of refraction are given as below:
(i) The incident ray, refracted ray and the normal to the refracting surface at the point of incidence lie in the same plane.
(ii) The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for the two given media. This constant is denoted by n and is called the relative refractive index.
n = sin i/sin r (Snell’s law)
where, n is refractive index of the second medium when first medium is air.

17. Total Internal Reflection (TIR) When a ray of light travelling from denser medium to rarer medium is incident at the interface of two medium at an angle greater than the critical angle for the two media, the ray is totally reflected back to denser medium. This phenomenon is called Total Internal Reflection. It occurs only when angle of incidence in denser medium is greater (not equal) than critical angle, i.e. i> i_c.

18. Principle of reversibility of light states that when final path of a ray of light after any number of reflections and refractions is reversed, the ray retraces its entire path.

22. Optical fibre, mirage, sparkling of diamond, totally reflecting prism, etc. work on the principle of total internal reflection.

24. Lens is a transparent medium bounded by two surfaces of which one or both surfaces are spherical.
(i) Convex or Converging Lens A lens which is thicker at the centre and thinner at its end is called convex lens.
Convex lenses are of three types which are given as below:

(ii) Concave or Diverging Lens A lens which is thinner at the centre and thicker at its ends is called a concave lens.
Concave lenses are of three types which are given as below:

25. Lens maker’s formula

26. When lens of refractive index μ is immersed in a medium of refractive index μ, then
(i) When lens is taken in another medium, then focal length changes to f_m which is given by

28. Power of Lens The ability of a lens to converge or diverge the rays of light incident on it is called the power of the lens.

29. Power of combination lenses in contact is given by

30. Magnification by combination of lenses
m = m₁ × m₂ × m₃ ………..
31. (i) Prism have got the property of bending the incident light towards its base.
A prism is a portion of a transparent medium bounded by two plane faces inclined to each other at a suitable angle.

(ii) When the prism is adjusted at angle of minimum deviation, then
(a) angle of incidence is equal to the angle of emergence

31. Dispersion by a Prism The phenomenon of splitting of light into its component colours is known as dispersion.
Angular Dispersion Angular dispersion produced by a prism for white light is the difference in the angles of deviation for two extreme colours i.e. violet and red.

Dispersive Power Dispersive power of a prism is defined as the ratio of angular dispersion to the mean deviation produced by the prism.

33. Combining two thin prisms we can study two conditions