(B) The luminous intensity $(I)$ is defined as the luminous flux $(\Phi)$ emitted by a light source per unit solid angle $(\Omega)$ in a given directi

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Luminous flux emitted by source per unit solid angle

(B) The luminous intensity $(I)$ is defined as the luminous flux $(\Phi)$ emitted by a light source per unit solid angle $(\Omega)$ in a given direction.The formula is given by:$I = \frac{\Phi}{\Omega}$Where:$I$ = Luminous intensity (measured in candela, $cd$)$\Phi$ = Luminous flux (measured in lumens, $lm$)$\Omega$ = Solid angle (measured in steradians, $sr$)Therefore, the correct definition is luminous flux emitted by the source per unit solid angle.

Class 12 Physics Wave Optics Mix Examples-Wave Optics

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$A$ source of light emits a continuous stream of light energy which falls on a given area. Luminous intensity is defined as

A
Luminous energy emitted by the source per second
B
Luminous flux emitted by source per unit solid angle
C
Luminous flux falling per unit area of a given surface
D
Luminous flux coming per unit area of an illuminated surface

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Mix Examples-Wave Optics

Light from a sodium lamp is passed through cold sodium vapours. The spectrum of the transmitted light consists of:

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The difference in the number of waves when yellow light propagates through air and vacuum columns of the same thickness is $1$. The thickness of the air column is $....\,mm$. [Refractive index of air $= 1.0003$,wavelength of yellow light in vacuum $= 6000\,\mathring{A}$]

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The figure shows a schematic diagram of the arrangement of Young's Double Slit Experiment. Choose the correct statement$(s)$ related to the wavelength of light used.

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Red light differs from blue light in its

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Properly arrange the effects with their reasons:

Effects Reasons

$(i)$ Rainbow formation $(a)$ Reflection

$(ii)$ Red colour of danger signals $(b)$ Scattering

$(iii)$ Different colours of thin oil film and soap bubbles $(c)$ Chromatic aberration

$(iv)$ Coloured images formed by lenses $(d)$ Dispersion

$(v)$ Different colours of clouds $(e)$ Interference

Effects	Reasons
$(i)$ Rainbow formation	$(a)$ Reflection
$(ii)$ Red colour of danger signals	$(b)$ Scattering
$(iii)$ Different colours of thin oil film and soap bubbles	$(c)$ Chromatic aberration
$(iv)$ Coloured images formed by lenses	$(d)$ Dispersion
$(v)$ Different colours of clouds	$(e)$ Interference

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$A$ source of light emits a continuous stream of light energy which falls on a given area. Luminous intensity is defined as

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Light from a sodium lamp is passed through cold sodium vapours. The spectrum of the transmitted light consists of:

The difference in the number of waves when yellow light propagates through air and vacuum columns of the same thickness is $1$. The thickness of the air column is $....\,mm$. [Refractive index of air $= 1.0003$,wavelength of yellow light in vacuum $= 6000\,\mathring{A}$]

The figure shows a schematic diagram of the arrangement of Young's Double Slit Experiment. Choose the correct statement$(s)$ related to the wavelength of light used.

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