Define power of a lens. What is its unit?

The power of a lens is a measure of the degree of convergence or divergence of light rays falling on it. The power of a lens is defined as the reciprocal of its focal length in metres. If P denotes the power of a lens and f denotes the focal length of the lens, the power is formulated as; P = 1 f ( in metres ) The SI unit of power of lens is dioptre ( D ).

E M B I B E

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 52

MEDIUM

10th CBSE

IMPORTANT

Earn 100

The radius of curvature of a convex mirror used as a rear-view mirror in a car is $4 m$ . A cycle is located at a distance of $7 m$ from the mirror. Find the position and the nature of the image formed.

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 1

What do you mean by reflection of light?

EASY

10th CBSE

IMPORTANT

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

State the laws of reflection.

EASY

10th CBSE

IMPORTANT

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

Draw a labelled diagram to illustrate the phenomenon of reflection from a plane surface. Mark the incident ray, reflected ray, normal, point of incidence, angle of incidence and angle of reflection in your diagram.

MEDIUM

10th CBSE

IMPORTANT

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

With the help of a diagram, explain the formation of the image of a point object by a plane mirror.

MEDIUM

10th CBSE

IMPORTANT

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

With the help of a diagram, explain the formation of image of an extended object by a plane mirror.

EASY

10th CBSE