EASY
10th ICSE
IMPORTANT
Earn 100

Describe any method to find the focal length of a convex lens. Why this method cannot be used to find the focal length of a concave lens.

Important Questions on Refraction Through a Lens

EASY
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 5 - Refraction Through a Lens>QUESTIONS>Q 10
A convex lens of focal length 20 cm is placed on a horizontal mirror. A pin is placed above the lens such that there is no parallax between the pin and its image. What is the height of the pin from the lens?
EASY
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 5 - Refraction Through a Lens>QUESTIONS>Q 11
Write any four applications of lenses.
EASY
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 5 - Refraction Through a Lens>QUESTIONS>Q 12

Copy the figure and complete it to show the formation of image of the object AB. Name the lens used.

Question Image

EASY
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 5 - Refraction Through a Lens>QUESTIONS>Q 14
The focal length of a convex lens and a concave mirror both is 20 cm. What would be the change in their focal lengths if the two are immersed in water?
EASY
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 5 - Refraction Through a Lens>QUESTIONS>Q 15
Two thin lenses of focal lengths +20 cm and -30 cm are put in contact. What is the focal length of the combination? What is the power of combination?
MEDIUM
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 5 - Refraction Through a Lens>QUESTIONS>Q 16
An object of height 5 cm is placed at a distance of 10 cm from a convex lens of focal length 15 cm. Use an appropriate scale and draw a ray diagram to obtain the image of the object. What is the size of the image? 
MEDIUM
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 5 - Refraction Through a Lens>QUESTIONS>Q 17
An object of height 5 cm is placed at a distance of 15 cm in front of a concave lens of focal length 10 cm. Use an appropriate scale and draw a ray diagram to obtain the image of the object. What is the size of the image? 
MEDIUM
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 5 - Refraction Through a Lens>QUESTIONS>Q 18
Draw the ray diagram to show the image formation through a hand lens. Write formula for its magnification.