How are focal length and power of a lens related?

Important Questions on Light - Reflection and Refraction

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 29

Define $1$ dioptre of power.

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 30

Calculate the power of a converging lens of focal length $40 \mathrm{cm}$.

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 31

A lens has a power of $-3 \mathrm{D}$. Is the lens concave or convex?

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 32

The power of lens is $+0.5 \mathrm{D}$. What is its focal length and type?

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 33

The power of a lens is $- 2.5 \mathrm{D}$. What is its focal length and type?

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 34

The power of one lens is $+ 2.5 \mathrm{D}$ and of another is $+ 3.5 \mathrm{D}$. Which of the two lenses will produce more bending of light?

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 35

A lens $\mathrm{P}$ has a focal length $15 \mathrm{cm}$ and another lens $\mathrm{Q}$ has focal length $30 \mathrm{cm}$. Which lens would you select to obtain a more convergent beam of light?

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 1

Draw a labelled diagram to show refraction of light by a rectangular glass slab. Mark the incident ray, emergent ray, refracted ray, normal, angle of incidence, angle of refraction and lateral displacement.