Define $1$ dioptre of power of a lens.

Important Questions on Light - Reflection and Refraction

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 2

A convex lens forms a real and inverted image of a needle at a distance of $50 \mathrm{cm}$ from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 3

Find the power of a concave lens of focal length $2 \mathrm{m}$.

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>EXERCISES>Q 1

Which one of the following materials cannot be used to make a lens?

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>EXERCISES>Q 2

The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>EXERCISES>Q 3

Where should an object be placed in front of a convex lens to get a real image of the same size of the object? 

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>EXERCISES>Q 4

Both spherical mirror and a thin spherical lens have a focal length of $-15 \mathrm{cm}$. The mirror and the lens are likely to be 

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>EXERCISES>Q 5

No matter how far you stand from a mirror, your image appears erect and smaller than you. The mirror is likely to be 

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>EXERCISES>Q 6

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?