SSC (English Medium) 10th Standard - Maharashtra State Board Important Questions

Calculate the focal length of a corrective lens having power +2D.

In a Std. X class out of 40 students 10 students use spectacles, 2 students have positive power and 8 students have negative power of lenses in their spectacles.

Answer the following questions:

(1) What does the negative power indicate?

(2) What does the positive power indicate?

(3) Generally which type of spectacles do most of the students use?

(4) What defect of eyesight do most of the students suffer from?

(5) Give two possible reasons for the above defect.

Calculate the focal length of a corrective lens having power +2.5 D.

What is myopia?

Explain two possible reasons of myopia. How can it be corrected? Explain with a suitable diagram.

Kavita from 10th is using spectacles. The power of the lenses in her spectacles is –2.5 dioptre. Answer the following questions:

1) Which lenses are used in her spectacles?

2) State the defect of vision Kavita is suffering from.

3) Find the focal length of the lenses used in her spectacles

An object is held 20 cm away from a converging lens of focal length 10 cm. Find the position of the image formed.

Name the defect shown in the diagram.

At which position will you keep an object in front of convex lens to get a real image smaller than the object? Draw a figure.

Observer the following diagram and answer the questions.
a) Which eye defect is shown in this diagram?
b) What are the possible reasons for this eye defect?
c) How this defect is corrected, write it in brief?

Surabhi from std. X uses spectacle. The power of the lenses in her spectacle is 0.5 D.

Answer the following questions from the given information:

1. Identify the type of lenses used in her spectacle.
2. Identify the defect of vision Surabhi is suffering from.
3. Find the focal length of the lenses used in her spectacle.

Rewrite the following table so as to match second and third column with first column.

Anuja cannot see the blackboard writing but she can see nearby things.
(a) What is the eye defect she is suffering from?
(b) State the possible reason for her defect.
(c) How is it corrected

Anuja’s father cannot see nearby objects clearly.
(a) What is the eye defect he is suffering from?
(b) How is it corrected?

In Myopia the human eye _______.

Write scientific reason.

Nearsightedness, this defect can be corrected by using spectacles with concave lens.

If focal length of a convex lens is 20 cm at what is the power of the lens?

Two convex lenses of focal length 30 cm and 10 cm each are kept in contact with each other. Find the power of their combination.

Complete the correlation:

Farsightedness : Convex lens : : Presbyopia : ______

Write a short note on Presbyopia.