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Acids, Bases And Salts

Question
CBSEENSC10012824
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Name and define the SI unit of power.

Solution
SI unit of power is dioptre (D).
One dioptre is defined as the power of a lens whose focal length is 1 metre. 

Clearly when, focal length, f = 1 m

Then, Power, P = 11 m = 1 m-1 = 1 dioptre (D).

Some More Questions From Acids, Bases and Salts Chapter

What is an optical medium? How can we classify different media on the basis of their behaviour towards light?

What do you mean by reflection, refraction and absorption of light?

Which type of phenomenon (reflection or refraction) occurs when light falls on (i) a highly polished surface like a mirror and (ii) a transparent medium like glass or water?

What is meant by the optical image of an object?

What are real and virtual images? Can these images be obtained on a screen? Give reasons in support of your answer.

Give three points of differences between real and virtual images.

What is a mirror? Mention the different types of mirrors commonly used.

Define the following terms in connection with reflection of light:
Incident ray, reflected ray, point of incidence, normal, angle of incidence and angle of reflection.

State the laws of reflection of light.

Are the laws of reflection applicable to plane surfaces also valid for curved surfaces?

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