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 8

EASY

10th CBSE

IMPORTANT

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Illustrate the converging nature of a concave mirror with the help of a diagram.

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 9

How would you estimate the approximate focal length of a converging mirror quickly?

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 10

Draw ray diagrams to show the formation of images when the object is placed in front of a concave mirror between its pole and focus.

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 10

Draw ray diagrams to show the formation of images when the object is placed in front of a concave mirror between its centre of curvature and focus.

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 11

Illustrate with the help of a diagram the position, nature and size of the image formed by a concave mirror, of an object placed beyond the centre of curvature of the mirror.

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 12

Draw labelled diagrams to show the formation of a real and a virtual image by a concave mirror. Label the pole, focus, centre of curvature and position of the object.

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 4 - Light - Reflection and Refraction>EXERCISE>Q 13

The diagram given shows an object placed between the centre of curvature and the focus of a spherical mirror. Redraw the diagram showing the formation of image of the object with the help of suitable rays.

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