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Myopia: (nearsightedness) This is adefectof vision in which far objects appear blurred but near objects are seen clearly. The image is focused in front of the retina rather than on it usually because the eyeball is too long or the refractive power of the eye's lens too strong.Please hit the like button if this helped you

Ans :- There aretwo typesof myopia. The first one is simple myopia (which is not considered a visual disease) which is less than 6 diopters. The second one is high myopia, when the patient exceeds 6 diopters, it is then an eye disease.

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in astigmatism the eye becomes more spherical and hence cylindrical lenses are to be used.

power of lens = +1.5Dfocal length = 1/P= 1/1.5= 2/3+0.67The prescribed lens is converging type in nature

this defect is myopia for correctionwe use concave lens

The defect show in the figure is hypermetropia

Far sightedness (Hypermetropic eye)

power of lens is given by power p aap equal to one upon app f is equal to 1 upon p B equal to f equal to one upon -1.5 f is equal to minus 6 point 6 centimetre since the power is negative the lens is of a diverging nature dot therefore it's a concave lens

Hypermetropia (long-sightedness) is a common eye condition where nearby objects appear blurred, but your vision is clearer when looking at things further away.

Hypermetropia, sometimes called hyperopia, is the term used to define being longsighted.

If you are hypermetropic, the image of a nearby object is formed behind the retina. This means that light is focused too far back in the eye, causing things which are close up to appear blurred.

How is it treated?

Both myopia and hypermetropia can be easily corrected by the Optometrist at your local Vision Express, using prescription glasses or contact lenses specifically designed to counteract their effects.

Shortsightedness is corrected using a concave (curved inwards) lens which is placed in front of a myopic eye, moving the image back to the retina and making it clearer.

Longsightedness is corrected using a convex (outward facing) lens. This is placed in front of a hypermetropic eye, moving the image forward and focusing it correctly on the retina.

A person withhypermetropia/hyperopia or long sight can see clearly objects far away from them, but not close to them.

This iscausedby the shape of the eye - the eyeball is slightly too short.

It iscorrectedby spectacles or contact lenses with lenses which are 'plus' or convex in shape

what is hypermetropia?

The magnitude of gravitational force on mass at origin is given by,

F=G×m×m/1^1+G×m×m/2^2+G×m×m/4^2+G×m×m/8^2+......

[Using,F=GMM'/r^2

Given,M=M'=m]

So,F=Gm×m[1+1/4+1/16+...]=Gm^2[1/4/1−1/4⎤⎦=Gm^2×1/3=Gm^2/3

but its given 4/3 Gm^2

The average brain weight in adult males is1,345 grams; in adult females,1,222 grams.

thanks

I was thinking answer is ciliary muscles .

There are three common defects of an eye. They are:

1) Myopia (Short-sightedness or Near-sightedness)

2) Hypermetropia (Long-sightedness or Far-sightedness)

3) Presbyopia

Hypermetropia (long-sightedness) is a common eye condition where nearby objects appear blurred, but your vision is clearer when looking at things further away. If you feel your eyes are often tired and you have problems focusing on objects close to your eyes, you may have hypermetropia.

a compass needle gets deflected when brought near to magnet because a compass in a magnetic field exert a magnetic force either the attraction or repulsion.

For myopia concave lens is used.

So, Option A is correct.

Myopia:(nearsightedness) This is a defect of vision in which far objects appear blurred but near objects are seen clearly. The image is focused in front of the retina rather than on it usually because the eyeball is too long or the refractive power of the eye’s lens too strong. Myopia can be corrected by wearing glasses/contacts with concave lenses these help to focus the image on the retina.

Hyperopia:(farsightedness) This is a defect of vision in which there is difficulty with near vision but far objects can be seen easily. The image is focused behind the retina rather than upon it. This occurs when the eyeball is too short or the refractive power of the lens is too weak. Hyperopia can be corrected by wearing glasses/contacts that contain convex lenses.

Astigmatism:This defect is when the light rays do not all come to a single focal point on the retina, instead some focus on the retina and some focus in front of or behind it. This is usually caused by a non-uniform curvature of the cornea. A typical symptom of astigmatism is if you are looking at a pattern of lines placed at various angles and the lines running in one direction appear sharp whilst those in other directions appear blurred. Astigmatism can usually be corrected by using a special spherical cylindrical lens; this is placed in the out-of-focus axis.

it's mometum remain same

yes it gets doubled when two are collision means kenitic energy

Kinetic energy = 1/2 mv^2

Kinetic energy is proportional to square of velocity(or speed)

So when speed is doubled, Kinetic energy becomes 4 times.

yes it gets doubled because speed is directly proportional to K. E

option B is the correct answer

yes it gets doubled in an kinetic energu

Its S Iunitof radius of gyration is m

we know that,acceleration=change in velocity/timea=v-u/tat=v-uat+u=vso, it is proved that v=u+at

It is a branch of mathematics concerned with the determination, properties, and application of integrals.

explain it briefly please

c.is correct answer....

option c is correct answer

option c is correct answer

option c is the correct answer of the given question

Final velocity, v = 1100 km/h= 1100 × 5/18 = 305.55m/sInitial velocity,u= 600 km/h= 600 × 5/18 = 166.66m/sAcceleration = 10 km/hper second = 10 × 5/18 = 2.77m/s2Time taken by body,v =u + att= (v -u)/at = (305.55 -166.66 )/2.77t = 50.14 sect≃50 sec

v²-u²=2ax0-(90)²=2a0.6thereforea=-1500ms-²now F=mathereforeF=0.04*-1500thereforeF=60N

The ability of a lens to converge/diverge a beam of light rays is expressed in terms of its Power(P). P=1/f The SI unit of power of lens is Dioptre.It is denoted by the letter "D" SI unit of length is metre(m) therefore 1D = 1/m or 1D = 1m-1

f1 = 40cm = 0.4m P1 = 1/f1 P1 = 1/0.4 P1 = 2.5 DSince Power is +ve therefore the lens with focal lenght 40cm is convex lens.

f2 = -20cm = -0.2m P2 = 1/f1 P2 = 1/-0.2P2 = -5D Since Power is -ve therefore the lens with focal lenght -20cm is concave lens.

The image formed by the concave lens is virtual, erect and diminished irrespective of the position of the object.

frictional force exerted by wall=0.5*50=25 N

two types of motion1 rotation2 revolution

According to thework-energy theorem, the net work on an object causes a change in the kinetic energy of the object. The formula for net work isnet work = change in kinetic energy = final kinetic energy - initial kinetic energy.

Explanation :

thanks for the answer

Generally speaking, the first physicalchanges during pubertyin girls are breast development andbodygrowth. Otherpuberty changesare:

Timing of Puberty.

Genitalia & Pubic Hair.

Growing.

Possible Breast Development.

Voice Change.

Body Hair.

Acne.