HARD
10th ICSE
IMPORTANT
Earn 100

Define and explain first focal point.

Important Questions on Refraction Through Lenses

HARD
10th ICSE
IMPORTANT
Self Study in Physics>Chapter 5 - Refraction Through Lenses>TEST YOURSELF>Q 9
What will be the effect on the focal length of a lens if a part of the lens is covered? What will be its effect on the intensity image formed?
HARD
10th ICSE
IMPORTANT
Self Study in Physics>Chapter 5 - Refraction Through Lenses>TEST YOURSELF>Q 10
A ray of light, after refraction through a concave lens emerges parallel to the principal axis. Draw a ray diagram to show the incident ray and its corresponding emergent ray.
HARD
10th ICSE
IMPORTANT
Self Study in Physics>Chapter 5 - Refraction Through Lenses>TEST YOURSELF>Q 11

Why do we say that convex lenses have real focus while concave lenses have a virtual focus?

HARD
10th ICSE
IMPORTANT
Self Study in Physics>Chapter 5 - Refraction Through Lenses>TEST YOURSELF>Q 12

State the changes in the position, size and nature of the image of an object when brought from infinity up to a concave lens. Illustrate your answer by drawing diagrams.

HARD
10th ICSE
IMPORTANT
Self Study in Physics>Chapter 5 - Refraction Through Lenses>TEST YOURSELF>Q 13
Describe in brief how would you determine the approximate focal length of a convex lens?
HARD
10th ICSE
IMPORTANT
Self Study in Physics>Chapter 5 - Refraction Through Lenses>TEST YOURSELF>Q 14
State two applications each of concave lens and convex lens.
HARD
10th ICSE
IMPORTANT
Self Study in Physics>Chapter 5 - Refraction Through Lenses>TEST YOURSELF>Q 15

Where is the object placed in reference to the principal focus of a magnifying glass so as the see its enlarges image?