Calculate the focal length of a lens of power $-2.75 \mathrm{D}$.

Important Questions on Light - Reflection and Refraction

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>Practice Problems : 4>Q 2

The power of a concave lens is $-12.5 \mathrm{D}$. What is the focal length of the lens?

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>Practice Problems : 5>Q 1

Two thin lenses of power $+4.5 \mathrm{D}$ and $-5 \mathrm{D}$ are placed in contact with each other. Calculate power of the combination.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>Practice Problems : 5>Q 1

Two thin lenses of power $+4.5 \mathrm{D}$ and $-5 \mathrm{D}$ are placed in contact with each other. Calculate focal length of the combination.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>Practice Problems : 5>Q 2

The power of a thin convex lens is $+3.5 \mathrm{D}$. It is placed in contact with another thin lens, such that the combined power is $+1.0 \mathrm{D}$. Calculate power of second lens.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>Practice Problems : 5>Q 2

The power of a thin convex lens is $+3.5 \mathrm{D}$. It is placed in contact with another thin lens, such that the combined power is $+1.0 \mathrm{D}$. Calculate focal length of the second lens.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>Practice Problems : 6>Q 1

Calculate the power and focal length of a combination of convex lens of focal length $25 \mathrm{cm}$ and concave lens of focal length $10 \mathrm{cm}$.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>Practice Problems : 6>Q 2

A convex lens of focal length $40 \mathrm{cm}$ is placed in contact with concave lens of focal length $25 \mathrm{cm}$. Calculate the power of the combination.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>Practice Problems : 6>Q 2

A convex lens of focal length $40 \mathrm{cm}$ is placed in contact with concave lens of focal length $25 \mathrm{cm}$. Calculate the focal length of the combination.