10th Standard CBSE Syllabus & Materials
10th Standard CBSE
cbse 10th Standard Social Science HIS - Print Culture and Modern World Important Questions And Answers Study Material - QB365 Set C
NEW10th Standard CBSE
cbse 10th Standard Social Science HIS - Print Culture and Modern World Important Questions And Answers Study Material - QB365 Set B
NEW10th Standard CBSE
cbse 10th Standard Social Science HIS - Print Culture and Modern World Important Questions And Answers Study Material - QB365 Set A
NEW10th Standard CBSE
cbse 10th Standard Social Science HIS - The Age of Industrialization Important Questions And Answers Study Material - QB365 Set C
NEW10th Standard CBSE
cbse 10th Standard Social Science HIS - The Age of Industrialization Important Questions And Answers Study Material - QB365 Set B
NEW10th Standard CBSE
cbse 10th Standard Social Science HIS - The Age of Industrialization Important Questions And Answers Study Material - QB365 Set A
Published on: 29/05/2021
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Questions + Answers key
Take MCQ Science Test1.
Why do we prefer a convex mirror as a rear view mirror in vehicles?
2.
Find the focal length of a lens of power - 2 D. What type of lens is this?
3.
How do you find the rough focal length of a convex lens? Is the same method applicable to a concave lens?
4.
What are the factors that determine the focal length of a lens?
5.
Does the method to find the approximate focal length of a convex lens is applicable to concave lens?
1.
The field of view of a convex mirror is wider than that of concave mirror and convex mirror always produces erect image of object, so we prefer convex mirror as rear view mirror for vehicles.
2.
\(\therefore\) Focal length, \(f=\frac{1}{Power}=\frac{1}{(-2)}=-0.5 \quad m\)
Since, f is negative, lens is concave.
3.
The rough focal length of a convex lens is obtained by forming sharp image of a very distant object on a screen. The distance of the screen from the lens gives us the rough focal length of the lens.
This method is not applicable to a concave lens, as image formed by a concave lens is virtual and it cannot be taken on the screen.
4.
The focal length of a lens depends on
(a) Radii of curvature of the surface of the lens.
(b) Nature of material of the lens.
(c) Nature of medium in which lens is placed.
5.
No, This method is not applicable to a concave lens, as image formed by a concave lens is virtual and it cannot be taken on the screen.
10th Standard CBSE Syllabus & Materials
10th Standard CBSE
cbse 10th Standard Social Science HIS - The Making of a Global World Important Questions And Answers Study Material - QB365 Set C
NEW10th Standard CBSE
cbse 10th Standard Social Science HIS - The Making of a Global World Important Questions And Answers Study Material - QB365 Set B
NEW10th Standard CBSE
cbse 10th Standard Social Science HIS - The Making of a Global World Important Questions And Answers Study Material - QB365 Set A
NEW10th Standard CBSE
cbse 10th Standard Social Science ECO - Consumer Rights Important Questions And Answers Study Material - QB365 Set C
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