Make a diagram to show how hypermetropia is corrected

Asked by admin @ 13/08/2021 in Physics viewed by 312 People

Q.7 Make a diagram to show how hypermetropia is corrected. The near point of a

hypermetropic eye is 1 m.
What is the power of the lens required to correct this
defect ? Assume that the near point of the normal eye is 25 cm.

Answered by admin @ 13/08/2021

(a) The hyper-metropic correction is shown below by using convex lens correction.

(b) first calculate the focal length of the convex lens required in this case. For hypermetropic eye can see the nearby object kept at 25 cm (at near point if normal eye) clearly if the image of this object is formed at its own near point which is 1 meter here.

Object distance, u = -25 cm (Normal near point)
Image distance, v = -1 m (Near point of this defective eye) = -100 cm
Focal length, f= ? (To be calculated)
Putting these values in the lens formula,
1/v - 1/u = 1/f

or, 1/f = 1/-100 - 1/-25

or, 1/f = -1/100 + 1/25 = 3/100

or, f = 100/3 cm

we know, power of lens can be calculated as , P = 1/ focal length in metre or 100/Focal length in cm

= 100/(100/3) = +0.33D

thus , power of convex lens required is +0.33D .

A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is

Asked by maham237 @ 13/01/2021 in Physics viewed by 1206 persons

Mind map for light reflection and refraction class 10

Asked by admin @ 23/08/2021 in Physics viewed by 1150 persons

The african cicada is the world's loudest insect, producing a sound intensity level of 107 db at a distance of 0.50 m. what is the intensity of its sound (in w/m2) as heard by someone standing 3.1 m away? express your answer in watts per meter squared.

Asked by maham237 @ 10/01/2021 in Physics viewed by 1101 persons

A thief runs at a speed of 10m s

Asked by admin @ 23/08/2021 in Physics viewed by 1098 persons

A 5.8 x 10 4 watt elevator motor can lift

Asked by maham237 @ 20/06/2021 in Physics viewed by 1082 persons

Make a diagram to show how hypermetropia is corrected

Similar Questions

A magician during a show makes a glass lens

The correct boolean operation represented by the circuit diagram

Match column a with column b to make correct sentences

Make a sketch showing groundwater and water table label it

Write the words in the correct order to make sentences

Show how to make a ten to solve 13 7

Show how to make a ten to find 12 4

Put the words in the correct order to make questions

Which venn diagram is not correct?

Which diagram correctly displays the order of events during egg formation?

A clock is set to show the correct time

Two and two make four is correct or not

Draw a circuit diagram to show how the torch works

Choose the correct html tag to make a text bold

What is the correct html for making a text area

Most viewed questions in Physics

Jeevandeep health and physical education std 10 answers pdf

Hc verma physics class 9 solutions of describing motion

How to leave nightmare land answer key

Base area and stability of some objects with different shapes

Which of the following statements about safe lifting are correct

Porous water-absorbing mass of fibers

Absorption of water by filter paper is due to

A composite wire of uniform diameter 3mm

At a distance l 400m from the traffic light

A rocket of mass m is launched straight up with thrust f⃗ thrust.

A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is

Mind map for light reflection and refraction class 10

The african cicada is the world's loudest insect, producing a sound intensity level of 107 db at a distance of 0.50 m. what is the intensity of its sound (in w/m2) as heard by someone standing 3.1 m away? express your answer in watts per meter squared.

A thief runs at a speed of 10m s

A 5.8 x 10 4 watt elevator motor can lift