(A) The power of a lens is defined as the reciprocal of its focal length in meters $(P = 1/f)$.The $SI$ unit of focal length is the meter $(m)$.Theref

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(A) The power of a lens is defined as the reciprocal of its focal length in meters $(P = 1/f)$.The $SI$ unit of focal length is the meter $(m)$.Therefore,the $SI$ unit of power is $m^{-1}$,which is commonly known as the Diopter $(D)$.

Class 10 Science Light – Reflection and Refraction Mix Examples - Light – Reflection and Refraction

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What is the $SI$ unit of the power of a lens?

A
Diopter
B
meter
C
watt
D
Volt

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Class 10 Questions

Class 10

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Chapter

Light – Reflection and Refraction

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Mix Examples - Light – Reflection and Refraction

Draw a labelled ray diagram to locate the image of an object formed by a convex lens of focal length $20 \, cm$ when the object is placed $30 \, cm$ away from the lens.

Medium

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Which type of reflection will be represented by light reflected from a book?

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The rays travelling parallel to the principal axis after reflecting from the concave mirror pass or appear to pass through the focus.

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The magnification equation is the same for both convex and concave mirrors.

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$(a)$ What happens to a ray of light when it travels from one medium to another having equal refractive indices?
$(b)$ State the cause of refraction of light.

Medium

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What is the $SI$ unit of the power of a lens?

Similar Questions

Draw a labelled ray diagram to locate the image of an object formed by a convex lens of focal length $20 \, cm$ when the object is placed $30 \, cm$ away from the lens.

Which type of reflection will be represented by light reflected from a book?

The rays travelling parallel to the principal axis after reflecting from the concave mirror pass or appear to pass through the focus.

The magnification equation is the same for both convex and concave mirrors.

$(a)$ What happens to a ray of light when it travels from one medium to another having equal refractive indices?$(b)$ State the cause of refraction of light.

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$(a)$ What happens to a ray of light when it travels from one medium to another having equal refractive indices?
$(b)$ State the cause of refraction of light.