Question

E. Very Short Answer Questions:
1. What is short sighted ? How is it corrected ?
2. Who developed Braille system?
3. What is blind spot and why has it been named so?
4. What is a spectrum ?
F. Short Answer Questions:
1. What is the blind spot of the eye?
2. State the laws of reflection,
3. What is meant by persistence of an image ? How is this property of the eye used in movie films?
G. Long Answer Questions:
1. Describe the construction of Kaleidoscope ?
2. When, how and where a rainbow is formed ?
3. Draw a labelled sketch of the human eye?
4. How will you take care of your eyes?



Pls answer the following questions fast ???​

Answer 1

Answer:

1) What is short sighted ? How is it corrected ?

Ans. Short-sightedness can usually be corrected using glasses made specifically to your prescription. ... Wearing a lens made to your prescription will ensure light is focused onto the back of your eye (retina) correctly so distant objects don't appear as blurry.

2) Who developed Braille system?

Ans. LOUIS BRAILLE (1809–1852) was born in Coupvray, a town in north central France, on January 4, 1809. At the age of three, he accidentally blinded himself in one eye with a stitching awl taken from his father's leather workshop.

3) What is blind spot and why has it been named so?

Ans. Blind spot is so called beacuse light do not flow on it and if flowed then it will not reflect the light coz it is blind spot .

4) What is a spectrum ?

Ans. A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary, without steps, across a continuum. The word was first used scientifically in optics to describe the rainbow of colors in visible light after passing through a prism.

5) What is the blind spot of the eye?

Ans. The spot where your optic nerve connects to your retina has no light-sensitive cells, so you can't see anything there. That's your blind spot.

6) State the laws of reflection.

Ans. The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.

7) What is meant by persistence of an image ? How is this property of the eye used in movie films?

Ans. The image produced in the human eye is retained for a very short period of time after the object is removed. This phenomenon is called persistence of vision. ... This means that when you are shown still pictures of a moving object at a rate faster than 16 pictures per second, the object will appear to be moving.

8) Describe the construction of Kaleidoscope?

Ans. A kaleidoscope is composed of a hollow tube. Three mirrors are placed in the form of a triangular tube and their reflecting surfaces face each other. One end of the tube is covered with a transparent sheet and another end is covered with an opaque sheet.

9) When, how and where a rainbow is formed ?

Ans. A rainbow is caused by sunlight and atmospheric conditions. Light enters a water droplet, slowing down and bending as it goes from air to denser water. The light reflects off the inside of the droplet, separating into its component wavelengths--or colors. When light exits the droplet, it makes a rainbow.

10) Draw a labelled sketch of the human eye?

Ans. (This ans is above)

11) How will you take care of your eyes?

Ans. • Eat a healthy, balanced diet.

• Maintain a healthy weight.
• Get regular exercise.
• Wear sunglasses.
• Wear protective eye wear.
• Avoid smoking.
• Know your family medical history.
• Know your other risk factors.