How is the power of a lens related to its focal length?

Important Questions on Light - Reflection and Refraction

EASY

10th CBSE

IMPORTANT

Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>IMPORTANT QUESTIONS>Q 41

Which physical quantity does the unit dioptre represent?

EASY

10th CBSE

IMPORTANT

Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>IMPORTANT QUESTIONS>Q 42

A thin lens has a focal length of $-25 \mathrm{cm}$. What is the power of the lens? Is it convex or concave?

EASY

10th CBSE

IMPORTANT

Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>IMPORTANT QUESTIONS>Q 1

What is reflection of light?

EASY

10th CBSE

IMPORTANT

Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>IMPORTANT QUESTIONS>Q 2

State the laws of reflection.

EASY

10th CBSE

IMPORTANT

Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>IMPORTANT QUESTIONS>Q 3

If an object is placed at $12 \mathrm{cm}$ from a plane mirror then what will be the distance between the object and image formed by the mirror?

EASY

10th CBSE

IMPORTANT

Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>IMPORTANT QUESTIONS>Q 4

Define pole of a spherical mirror.

EASY

10th CBSE

IMPORTANT

Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>IMPORTANT QUESTIONS>Q 5

Define the principal focus of a concave mirror.

EASY

10th CBSE

IMPORTANT

Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>IMPORTANT QUESTIONS>Q 6

Write mirror formula and explain the terms involved.