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Luminous Intensity

Luminous flux...

Question

Luminous flux and luminous intensity are related as

ϕ = 4 π I

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ϕ = \frac{1}{4 π}

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ϕ = \frac{4 π}{I}

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I = 4 π ϕ

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Solution

The correct option is A $ϕ = 4 π I$
Luminous flux is the amount of perceived power of light. It is measures energy.While luminous intensity $I$ is ratio of luminous flux to solid angle
i.e, $ϕ = 4 π I$

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Similar questions

Let A = { $ϕ$ { $ϕ$ }, 1, {1, $ϕ$ }, 2}. Which of the following are true ?

(i) $ϕ ϵ A$ (ii) { $ϕ$ } $ϵ$ A

(iii) {1} $ϵ$ A (iv) {2, $ϕ$ } $\subset$ A

(v) 2 $\subset$ A (vi) {2, {1}} $⊈$ A

(vii) {{2}, {1}}, $⊈$ A

(viii) { $ϕ$ , { $ϕ$ } , {1, $ϕ$ }} $\subset$ A

(ix) {{ $ϕ$ }} $\subset$ A.

A = \{ϕ, \{ϕ\}, 1, \{1, ϕ\}, 2\}

ϕ \in A

\{ϕ\} \in A

\{1\} \in A

\{2, ϕ\} \subset A

2 \subset A

\{2 \{1\}\} ⊄ A

\{\{2\}, \{1\}\} ⊄ A

\{ϕ, \{ϕ\}, \{1, ϕ\}\} \subset A

\{\{ϕ\}\} \subset A

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