SATHEE: Optics Question 500

Optics Question 500

Question: Two lamps of luminous intensity of 8 Cd and 32 Cd respectively are lying at a distance of 1.2 m from each other. Where should a screen be placed between two lamps such that its two faces are equally illuminated due to two sources

Options:

A) 10 cm from 8 Cd lamp

B) 10 cm from 32Cd lamp

C) 40 cm from 8 Cd lamp

D) 40 cm from 32 Cd lamp

Show Answer

Answer:

Correct Answer: C

Solution:

$I = \frac{L}{r^{2}} \Rightarrow \frac{L_{1}}{L_{2}} = \frac{r_{1}^{2}}{r_{2}^{2}}$

or $\frac{8}{x^{2}} = \frac{32}{{(120 - x)}^{2}}$

Solving it we get $x = 40 c m$ .

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Optics Question 500

Question: Two lamps of luminous intensity of 8 Cd and 32 Cd respectively are lying at a distance of 1.2 m from each other. Where should a screen be placed between two lamps such that its two faces are equally illuminated due to two sources

Options:

Answer:

Solution:

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